American Diploma · ACT · English: Usage

ACT Verb Tense and Verb Forms

Choosing the tense from time clues and the passage, present perfect vs past simple, the past perfect, irregular past participles, “would have” (not “would of”) and conditionals — with worked examples and an ACT-style quiz.

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Verb questions on ACT English test two things. Tense: does the verb show the right time — past, present, future — and the right relationship between two times (before, since, by then)? Form: is the verb built correctly — “had swum”, not “had swam”; “would have”, not “would of”? Native speakers make these mistakes in conversation every day, so the test uses them often. This lesson teaches you to read the time clues and to know the forms by heart.

What this question type tests

Verb tense and form belong to Conventions of Standard English, which is 38–43% of the 40 scored English questions (together with punctuation, sentence structure and the other usage topics). A verb is underlined, and the choices show the same verb in different tenses (opened / has opened / had opened / opens) or different forms (swam / swum / had swam / had swum).

If the choices are all in the same tense but differ in singular/plural, it is an agreement question (see the subject–verb lesson). If they differ in time, use the method below.

Look for a time clue in the sentence: a date, yesterday, since, for, by the time, before, now, every year.
Look at the tense of the paragraph, especially the verbs that are not underlined. Unless the time really changes, keep the same tense.
Check the form: after has/have/had you need the past participle; after will, would, can, could, should, might, must and to you need the base form.

Rule 1: Let the time clues choose the tense

Time clue	Tense	✓ Example
every day, usually, always, often; general facts	present simple	The Nile flows north.
now, at the moment, currently	present continuous	The workers are repairing the road now.
yesterday, last week, in 1990, two years ago, when I was ten	past simple	The bridge opened in 1990.
while / when + an action in progress in the past	past continuous	I was reading when the lights went out.
since, for, so far, already, yet, recently, ever, never (up to now)	present perfect	She has lived in Giza since 2015.
by the time / before / after + a past event; already in a past story	past perfect	By the time we arrived, the film had started.
tomorrow, next year, soon	future	The museum will reopen next year.
by + a future time	future perfect	By June, they will have finished the tunnel.

Keep the passage’s tense. A story about the past stays in the past unless something is still true now. ✗ Last summer we visit Siwa and swam in the salt lakes. ✓ Last summer we visited Siwa and swam in the salt lakes. A general fact, however, can stay in the present inside a past story: ✓ Our guide explained that the salt lakes are so salty that you cannot sink.

Writing about a book, a film or a painting normally uses the present tense: ✓ In the novel, the hero leaves his village and travels to Cairo. If the passage does this, keep the present.

Rule 2: Present perfect or past simple?

Both talk about the past, but they look at it differently.

Past simple (did)	Present perfect (has / have done)
A finished time: yesterday, in 2010, last month, ago, when…	An unfinished time that reaches now: since, for (up to now), so far, this year, recently
✓ He won the race in 2019.	✓ He has won three races since 2019.
✗ He has won the race in 2019.	✗ He won three races since 2019.
✓ I lost my keys yesterday.	✓ I have lost my keys. (They are still lost now.)
✓ She worked in Luxor for ten years. (She does not work there now.)	✓ She has worked in Luxor for ten years. (She still works there.)

Quick rule: since + a starting point almost always needs the present perfect (or the past perfect in a past story). A specific finished time (in 2019, ago, last year) never takes the present perfect.

Rule 3: Past perfect for the earlier past

When a passage is already in the past and you need to go further back, use the past perfect: had + past participle. It marks the action that happened first.

✓ When the firefighters arrived, the fire had already spread to the roof. (The spreading came first.)
✓ By the time I reached the station, the train had left.
✓ She recognised the street because she had lived there as a child.
✗ When the firefighters arrived, the fire has already spread. (present perfect in a past story)
Use the past perfect only for the earlier action. ✗ By the time I reached the station, the train had left, so I had missed it. ✓ …the train had left, so I missed it. (The missing happened when you arrived, not before.)

Do not use the past perfect when there is no earlier past action to compare with: ✗ Yesterday I had visited my aunt. ✓ Yesterday I visited my aunt.

الأزمنة من الكلمات اللي حوالين الفعل

دوّر على كلمات الوقت: since و for معناها present perfect (has / have + التصريف التالت). yesterday و in 2019 و ago معناها ماضي بسيط. ولو القصة في الماضي وعايز ترجع لحاجة حصلت قبلها، استخدم had + التصريف التالت: By the time we arrived, the film had started.

Rule 4: Irregular past participles

After has, have, had (and after be in the passive: is/was written), you need the past participle — the third form. With regular verbs the second and third forms are the same (walked, walked). With irregular verbs they are often different, and the ACT tests exactly these.

Base	Past simple	Past participle (has/have/had…)
swim	swam	swum — ✓ had swum ✗ had swam
go	went	gone — ✓ had gone ✗ had went
choose	chose	chosen — ✓ had chosen ✗ had chose
begin	began	begun — ✓ has begun ✗ has began
drink · ring · sing · sink · shrink	drank · rang · sang · sank · shrank	drunk · rung · sung · sunk · shrunk
write · ride · drive · rise	wrote · rode · drove · rose	written · ridden · driven · risen
take · shake · break · speak · steal · freeze	took · shook · broke · spoke · stole · froze	taken · shaken · broken · spoken · stolen · frozen
give · eat · fall · forget · hide · bite	gave · ate · fell · forgot · hid · bit	given · eaten · fallen · forgotten · hidden · bitten
grow · know · throw · fly · draw	grew · knew · threw · flew · drew	grown · known · thrown · flown · drawn
wear · tear · see · do	wore · tore · saw · did	worn · torn · seen · done
come · become · run	came · became · ran	come · become · run — ✓ has come ✗ has came; ✓ had run ✗ had ran
lie (rest) · lay (put) · lead	lay · laid · led	lain · laid · led

The error also works the other way: the past participle can never be the main verb on its own. ✗ She swum across the river. ✓ She swam across the river. ✗ I seen the film. ✓ I saw the film / I have seen the film. ✗ He done his homework. ✓ He did / has done his homework.

After will, would, can, could, should, may, might, must and after to, use the base form: ✓ She can swim. ✓ They decided to choose a new name. ✗ They decided to chose a new name.

Rule 5: would have, could have, should have — never “of”

In speech, “would’ve” sounds like “would of”, but of is a preposition and can never follow a modal verb. The correct form is modal + have + past participle.

✗ Wrong	✓ Right
We should of left earlier.	We should have left earlier.
She could of won the match.	She could have won the match.
They must of forgotten the time.	They must have forgotten the time.
I would have went with you.	I would have gone with you. (participle after have)
He might of took the wrong bus.	He might have taken the wrong bus.

Rule 6: Conditionals (if-sentences)

Type	If-clause	Main clause	✓ Example
Real / general	present	present or will	If it rains, the match is / will be cancelled.
Unreal now (imaginary)	past simple (were for all persons)	would + base form	If I were the principal, I would change the timetable.
Unreal past (it did not happen)	had + past participle	would / could / might have + past participle	If we had left earlier, we would have caught the train.

Never put would in the if-clause. ✗ If I would have known, I would have helped. ✓ If I had known, I would have helped. ✗ If she would study, she would pass. ✓ If she studied, she would pass.
Match the two halves. ✗ If the team had trained harder, they would win last year’s final. ✓ …they would have won last year’s final.
“Were” for imaginary situations: ✓ If he were taller, he would play basketball. ✓ I wish I were in Alexandria. (Many speakers say “was”, but the test prefers “were”.)
Inverted form (formal): ✓ Had I known, I would have helped. = If I had known…

would of غلط دايمًا

بعد would و could و should و must و might بنكتب have مش of، وبعدها التصريف التالت: should have gone. وفي جمل if عن حاجة ماحصلتش في الماضي: If + had + التصريف التالت، والجزء التاني would have + التصريف التالت. وماينفعش would تيجي بعد if.

Worked examples

Each example is part of an ACT-style essay. The underlined portion is shown in bold.

Worked example 1. “Since the new bridge opened in 2019, traffic in the town center fell by almost half.”

Question: Choose the best version of the underlined portion. If the original is best, choose NO CHANGE.

A) NO CHANGE
B) has fallen
C) has fell
D) falls

Answer: B.

B is correct. “Since the new bridge opened” describes a period that started in the past and continues now, so the present perfect is needed: has + past participle “fallen”.
A is the past simple, which needs a finished time, not “since”.
C uses the past simple “fell” after “has” — a wrong participle.
D is the present simple; it describes a habit, not a change up to now.
Note: “opened” is correctly past simple — “in 2019” is a finished time.

Worked example 2. “When the firefighters finally arrived at the warehouse, the fire already spread to the second floor.”

Question: Choose the best version of the underlined portion. If the original is best, choose NO CHANGE.

A) NO CHANGE
B) has already spread
C) had already spread
D) already spreading

Answer: C.

C is correct. The story is in the past (arrived), and the spreading happened before the arrival, so the past perfect “had already spread” is needed.
A is the past simple; with “already” and an earlier action, it does not show the correct order.
B is the present perfect, which does not fit a past story.
D has no helping verb, so the clause has no complete verb.

Worked example 3. “By noon, the three divers had swam farther along the reef than anyone in the club expected.”

Question: Choose the best version of the underlined portion. If the original is best, choose NO CHANGE.

A) NO CHANGE
B) swum
C) have swum
D) had swum

Answer: D.

D is correct. After “had” you need the past participle: swim – swam – swum. The past perfect fits “By noon”.
A uses the past simple “swam” after “had”.
B uses the participle alone, without a helping verb.
C is present perfect, which does not fit a past narrative (“expected”).

Worked example 4. “If the hikers had checked the weather forecast, they would of postponed the trip to Saint Catherine.”

Question: Choose the best version of the underlined portion. If the original is best, choose NO CHANGE.

A) NO CHANGE
B) would have
C) would had
D) will have

Answer: B.

B is correct. This is an unreal past conditional: If + had checked → would have + past participle (postponed). “Would of” is never correct.
A writes “of”, which sounds like “’ve” but is a preposition.
C puts “had” after “would”; after a modal you need the base form “have”.
D uses the future “will”, which does not match the past condition.

Classic traps

Simple past after had/has/have: had swam, had went, has began, had chose, has came.
Participle used alone as a past verb: she swum, I seen, he done.
would of / should of / could of → would have / should have / could have.
Present perfect with a finished time: has won in 2019 → won in 2019. Past simple with since: won since 2019 → has won since 2019.
would in the if-clause: If I would have known → If I had known.
Tense shift for no reason: a past paragraph suddenly switching to the present (or the opposite).

Fast strategy for test day

Circle the time clue: since/for → present perfect; ago/in 2010/yesterday → past simple; by the time/before + past → past perfect.
Read the verbs that are NOT underlined in the paragraph and match their tense.
After has/have/had → third form (swum, gone, chosen). After will/would/can/to → base form.
See “of” after would/could/should/must/might? Eliminate it.
if + had done → would have done; never would after if.

Practice

Two ACT-style essays with 5 questions each, all on verb tense and verb forms. The numbers in brackets match the question numbers.

Remember

Let the time clues decide: since/for → present perfect; ago, in 2010, yesterday → past simple; by the time / before + past → past perfect.
Keep the paragraph’s tense unless the time really changes.
After has/have/had use the past participle: swum, gone, chosen, begun, written. A participle is never a main verb alone.
would have / could have / should have — never “of”.
if + had done → would have done; never “would” in the if-clause; “were” for imaginary situations.

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