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Verb Tense, Aspect and Finiteness

Choose the right tense from time clues and the rest of the passage, and know when a sentence needs a finite main verb and when an -ing or to-verb form is correct.

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Two related skills share this page. Tense and aspect questions ask *when* an action happens and how it relates to other actions (did, has done, had done, was doing, will have done). Finiteness questions ask whether a verb form can be the main verb of a sentence at all (completes / completed vs completing / to complete). Both are on the official list for Form, Structure, and Sense, and both are solved with short, reliable checks.

What this question type tests

These questions belong to Standard English Conventions, about 26% of the scored Reading and Writing questions (about 11–15 questions). The official skills include verb tense and aspect and verb finiteness (gerunds, participles and infinitives versus finite verbs). They usually appear in the later part of each module.

The stem is: "Which choice completes the text so that it conforms to the conventions of Standard English?" Look at the four choices to see which skill is being tested:

The choices look like …	The question tests …	Your first check
discovered / has discovered / had discovered / will discover	Tense and aspect	Time clues and the other verbs in the passage
attracts / attracting / to attract / having attracted	Finiteness	Does the sentence already have a main verb?
is / are / was / were	Agreement + tense	Subject first (see Subject–Verb Agreement), then tense

بص على الاختيارات الأول

لو الاختيارات نفس الفعل في أزمنة مختلفة (did / has done / had done) دوّر على كلمات الوقت والأفعال التانية في القطعة. لو الاختيارات فيها ‎-ing و to والتصريف التالت، اسأل نفسك: هل الجملة فيها فعل أساسي ولا لأ؟ الجملة من غير فعل أساسي = جملة ناقصة (fragment).

Part A — Tense and aspect

Tense is the time (past, present, future). Aspect adds information about the action: is it simple (a fact or a complete action), progressive (in progress: be + -ing) or perfect (completed before a certain point: have + past participle)? The SAT tests the forms below.

Form	Structure	Use	✓ Example
Simple present	studies / study	Facts, habits, general truths; what a text, author or study says	Water boils at 100°C. The author argues that …
Simple past	studied	A finished action at a stated past time	The temple was moved in 1968.
Present perfect	has / have studied	From the past up to now (since, for, so far, recently); past action with no stated time	Scientists have studied the reef since 2010.
Past perfect	had studied	The earlier of two past actions; "by the time" + past	By the time the rescue team arrived, the fire had spread.
Present progressive	is / are studying	In progress now, currently	Engineers are testing the new design.
Past progressive	was / were studying	In progress when something else happened	She was scanning the sky when she saw the comet.
Future / future perfect	will study / will have studied	Later; completed before a future point (by 2030)	By 2030, the city will have finished the line.

How to choose the tense: three clues

Time words. They are the strongest clue. Learn the table below.
The other verbs in the passage. If the passage tells a past story, stay in the past unless a time word moves you. If it states facts or describes a study, the present is normal.
The order of events. Two past events? The one that happened first may need had + past participle.

Time clue	Usual form	✓ Example	✗ Trap
in 1990, last year, two weeks ago, yesterday, in the 1800s	Simple past	The canal opened in 1869.	The canal has opened in 1869.
since + point, for + period (still true), so far, recently, over the past decade	Present perfect	Since 2015, visitor numbers have risen.	Since 2015, visitor numbers rose.
by the time / before / after + past event; already (in a past story)	Past perfect	By the time the dam was finished, the temple had been moved.	By the time the dam was finished, the temple has been moved.
when / while + another past action	Past progressive (the longer action)	He was reading when the lights went out.	He reads when the lights went out.
currently, now, at present, these days	Present (simple or progressive)	The museum is currently restoring the boat.	The museum currently restored the boat.
by + future date, by the end of next year	Future perfect	By 2030, they will have planted a million trees.	By 2030, they had planted …

Literary present

When a passage describes what a book, author, poem or study says or shows, the SAT uses the present tense: "In the novel, the narrator remembers her childhood." But events *inside* a story can still be told in the past: "Every evening, they sat on the roof." Follow the tense the passage itself uses for the story.

Do not over-use "had"

The past perfect (had done) is only correct when there is a second, later past moment in the sentence or passage. If there is just one past event at a stated time, use the simple past: "In 1799, soldiers discovered the stone" — not "had discovered".

Part B — Finiteness: every sentence needs a real main verb

A finite verb shows tense and can be the main verb of a clause: *walks, walked, is walking, has walked, will walk, can walk*. A non-finite form cannot do this job alone:

Non-finite form	Looks like	Can it be the main verb alone?	✗ Fragment	✓ Fixed
Infinitive	to + verb (to protect)	No	The new wall to protect the village.	The new wall protects the village.
-ing form (gerund / present participle)	protecting	No	The engineers testing the bridge for months.	The engineers tested the bridge for months.
Past participle	protected, written, built	No (without has/had/is/was)	The ancient city, built near the river.	The ancient city was built near the river.
Perfect participle	having + past participle	No	The team having completed the survey.	The team had completed the survey.

The finiteness test: find the subject, then find its verb. If there is no finite verb for that subject, the blank must supply one. If the subject already has a finite verb, the blank is usually a non-finite modifier (or needs a joining word like *and* or *which*).

The long-subject trap

The SAT often builds a very long subject with modifiers, so that you forget a main verb is still needed. Strip the sentence down:

"The Great Library of Alexandria, founded in the third century BCE and supported by the Ptolemaic kings, ______ scholars from across the Mediterranean."
Cross out the extra information between the commas: "The Great Library ______ scholars."
The subject Library has no verb yet → the blank needs a finite verb: attracted. *Founded* and *supported* are participles in the modifier, not main verbs.

When a non-finite form IS correct

Situation	✓ Example
The sentence already has a main verb, and a phrase after a comma describes the result or the manner	The river flooded, forcing hundreds of families to leave.
A phrase at the start describes the subject	Working through the night, the engineers finished the repair.
Purpose (in order to)	Farmers flood the fields to stop weeds.
After verbs that take an infinitive or -ing	They decided to build … / She avoided using …
After a helping or modal verb	has built, was building, can build, will have built
A participle after a noun (reduced relative clause)	The tablets found at Amarna are letters. (= that were found)

فخ الجملة الطويلة

لما الفاعل يكون طويل ومعاه كلام كتير بين فاصلتين، شيل الكلام ده واسأل: الفاعل ده فعله فين؟ لو مفيش فعل لسه، يبقى الفراغ محتاج فعل كامل زي attracted / is / give. لكن لو الجملة فيها فعلها خلاص، يبقى الفراغ غالبًا ‎-ing أو to + فعل (معلومة زيادة)، ولو حطيت فعل كامل بعد فاصلة هتعمل comma splice.

The method for test day

Read the choices. Different times → tense. -ing / to / participle mixed with finite verbs → finiteness.
Finiteness first: find the subject of the clause with the blank. Does it already have a finite verb? No → choose a finite verb. Yes → choose a non-finite form (or the choice with a joining word).
Then tense: underline time words (since, by the time, in 1990, currently) and the tense of the other verbs.
Check agreement if the finite choices differ in -s / is–are / has–have.
Read the full sentence with your answer. It should be one complete sentence, not a fragment and not a comma splice.

Worked examples

Worked example 1: by the time → past perfect

Passage: "By the time the Aswan High Dam was completed in 1970, engineers and archaeologists ______ the temples of Abu Simbel to higher ground, saving them from the rising waters of Lake Nasser."

Question: Which choice completes the text so that it conforms to the conventions of Standard English?

A) moved
B) have moved
C) had moved
D) will have moved

Answer: C) had moved. "By the time" + a past event (the dam was completed in 1970) tells you the moving happened before that past moment. The earlier of two past actions takes the past perfect: "had moved".

A) moved — Simple past does not show that the move was already complete before 1970; with "by the time" the SAT expects the past perfect.
B) have moved — Present perfect connects to now, but the passage is about a finished past period.
D) will have moved — Future perfect is for a future point, not 1970.

Worked example 2: since → present perfect

Passage: "The Cairo International Book Fair first opened in 1969. Since then, the event ______ into one of the largest book fairs in the Arab world, attracting many publishers and readers every year."

Question: Which choice completes the text so that it conforms to the conventions of Standard English?

A) grew
B) has grown
C) had grown
D) grows

Answer: B) has grown. "Since then" describes a period from the past up to now, and the fair still happens "every year". That is the present perfect: "has grown".

A) grew — Simple past is for a finished action at a stated time; it does not fit "since".
C) had grown — Past perfect needs a later past moment; the period continues to the present.
D) grows — Simple present does not show growth over a period that started in 1969.

Worked example 3: missing main verb

Passage: "The Great Library of Alexandria, founded in the third century BCE and supported by the Ptolemaic kings, ______ scholars from across the Mediterranean who came to study its enormous collection of scrolls."

Question: Which choice completes the text so that it conforms to the conventions of Standard English?

A) attracting
B) to attract
C) attracted
D) having attracted

Answer: C) attracted. Cross out the modifier between the commas: "The Great Library ______ scholars." The subject has no main verb yet, so the blank must be a finite verb. Only "attracted" is finite (past tense, fits the historical context).

A) attracting — An -ing form cannot be the main verb alone; the sentence becomes a fragment.
B) to attract — An infinitive cannot be the main verb; fragment.
D) having attracted — "Having attracted" is a participle; still no main verb, so it is a fragment.

Worked example 4: the main verb is already there

Passage: "Last spring, volunteers planted thousands of mangrove seedlings along the Red Sea coast near Hurghada, ______ to protect the shoreline from erosion and to give young fish a safe place to grow."

Question: Which choice completes the text so that it conforms to the conventions of Standard English?

A) they hoped
B) hoping
C) hopes
D) and hoping

Answer: B) hoping. The sentence already has its subject and finite verb: "volunteers planted". After the comma we need a modifier that describes the volunteers, not a second main verb. The participle "hoping" does this correctly.

A) they hoped — "They hoped" is a complete clause after a comma with no joining word: a comma splice.
C) hopes — "Hopes" is a finite verb with no subject of its own, and it is singular and present.
D) and hoping — "And hoping" is not parallel: "planted … and hoping" joins a finite verb with an -ing form.

Classic traps

Fragment trap: a long subject with participles (founded, built, located, including) and no main verb. Choose the finite verb.
Comma-splice trap: the sentence already has a main verb, and a choice adds a second subject + verb after a comma (", they hoped"). Choose the -ing / to form.
"Had" trap: past perfect when there is only one past time. Use the simple past with a stated date.
"Since" trap: simple past with since / for (still true). Use has / have + past participle.
Tense-switch trap: a present verb in the middle of a past story (or the opposite) with no time clue for the change.
Being / having trap: "being" and "having + past participle" are almost never the main verb the SAT wants.

Fast strategy for test day

First ask "Does this clause have its main verb?" — it decides finite vs non-finite in five seconds.
Circle the time words: since → has/have; by the time + past → had; in + year → simple past; by + future date → will have.
When there are no time words, copy the tense of the nearest verbs in the passage.
Read the sentence once with your choice: it must be one complete sentence — no fragment, no splice.
Target time: 30–45 seconds.

Practice

Twelve original test-style questions mixing tense and finiteness. Decide first whether the blank needs a main verb, then check the time clues.

Remember

Every clause needs a finite main verb. -ing, to + verb and a past participle alone cannot be the main verb.
If the clause already has its main verb, the blank is usually a non-finite modifier; adding a second subject + verb after a comma is a comma splice.
Time clues decide tense: in 1990 → did; since / for → has done; by the time + past → had done; when + past action → was doing; by + future date → will have done.
With no time clue, keep the tense of the passage. Descriptions of what a text or study says use the present.
Check finiteness first, tense second, agreement third.

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Information and Ideas

Standard English Conventions

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