American Diploma · ACT · English: Punctuation

ACT Semicolons: Joining Sentences and the List Rule

How ACT English tests the semicolon — joining two complete, related sentences (with or without however/therefore), the SAT/ACT extra rule for lists whose items contain commas, and every wrong use — with worked examples and an ACT-style quiz.

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The semicolon (;) looks difficult, but on the ACT it follows one simple main rule and one extra rule. If you can recognise a complete sentence, you can answer every semicolon question correctly. This lesson teaches both rules, every wrong use the test sets as a trap, and how to choose between a semicolon, a comma and a period.

What this question type tests

Semicolon questions belong to the Conventions of Standard English category, which is 38–43% of the 40 scored English questions. As with other punctuation questions, a portion of the essay is underlined and the four choices differ in their punctuation, usually with NO CHANGE first. Very often a semicolon appears in a wrong choice, so knowing when it is not allowed is just as important as knowing when it is.

The main rule: a semicolon joins two complete, closely related sentences

A semicolon works like a soft period. It sits between two independent clauses (two complete sentences) whose ideas are closely related. The quick test: if you could put a period in that spot, you can put a semicolon there. If a period would leave a fragment on either side, a semicolon is wrong.

✓ The library closes at six; the reading room closes at five.
✓ The tower did not fall in a single day; a series of earthquakes damaged it over centuries.
✓ Our school is full of energy; the corridors are loud from the first bell to the last.
✗ Because the road was flooded; the buses stopped. (“Because the road was flooded” cannot stand alone.)
✗ The divers found many objects; such as statues and columns. (“such as statues and columns” is not a sentence.)

The period test

Cover the semicolon and put a period in its place. Read the part before it: is it a full sentence? Read the part after it: is it a full sentence? Two yeses → the semicolon is correct. One no → it is wrong.

Remember the toolkit. Two complete sentences can be joined in exactly these ways on the ACT:

Correct ways to join Sentence 1 + Sentence 2	Example
Period	The road was closed. We walked.
Semicolon	The road was closed; we walked.
Comma + FANBOYS (for, and, nor, but, or, yet, so)	The road was closed, so we walked.
Semicolon + conjunctive adverb + comma	The road was closed; therefore, we walked.
✗ Comma alone (comma splice)	The road was closed, we walked.
✗ Nothing (run-on)	The road was closed we walked.

Because a period and a semicolon do the same job here, the ACT never asks you to choose between them: if both appear in the choices and both are correct, look again — one of the other parts of those choices will be wrong.

Semicolons with conjunctive adverbs (however, therefore…)

Words such as however, therefore, moreover, consequently, nevertheless, instead, otherwise, in addition, as a result, for example are conjunctive adverbs (transition words). They connect ideas, but they are not FANBOYS conjunctions, so they cannot join two sentences with only a comma. When one of them begins the second sentence, use a semicolon before it and a comma after it.

✓ The water was cloudy; however, the divers mapped the site.
✓ The water was cloudy; as a result, the work took years.
✗ The water was cloudy, however, the divers mapped the site. (comma splice)
✗ The water was cloudy, however the divers mapped the site. (comma splice)
✗ The water was cloudy however; the divers mapped the site. (the semicolon is on the wrong side of “however”)

Where is the boundary? The semicolon goes at the point where the first sentence ends. If “however” begins the second sentence, the semicolon comes before it. If “however” is only an interruption in the middle of one sentence, it takes a pair of commas and no semicolon at all.

✓ The school, however, already has an empty room. (one sentence: “however” is an interruption → commas)
✗ The school; however, already has an empty room. (“The school” is not a sentence)
✓ The plan is cheap; the school, however, must still approve it. (two sentences; “however” interrupts the second one)

SAT/ACT extra rule: semicolons in a list whose items contain commas

This use belongs to the SAT and the ACT. When the items in a list already contain commas, separate the items with semicolons so the reader can see where each item ends.
✓ The team visited Kom Ombo, where many families had resettled; Aswan, the city closest to the old villages; and Cairo, the capital.
✗ The team visited Kom Ombo, where many families had resettled, Aswan, the city closest to the old villages, and Cairo, the capital. (impossible to see the three items)
Keep the semicolon before the final “and”. Inside each item, the commas stay as commas.
Use this rule only when the items contain commas. In a simple list (bread, cheese, and olives) semicolons are wrong.
The words before the list still follow the normal rules: if a complete sentence introduces the list, a colon may come before it; otherwise, nothing.

Every wrong use of the semicolon

The ACT tests semicolons mostly through wrong choices. Each of these is always wrong:

Wrong use	✗ Wrong	✓ Right
After a dependent clause (because, when, although, if, since…)	Although it was late; we kept working.	Although it was late, we kept working.
Before a dependent clause	We kept working; because the deadline was near.	We kept working because the deadline was near.
Before a list (introduced by a complete sentence)	She packed three things; bread, cheese, and olives.	She packed three things: bread, cheese, and olives.
Between items of a simple list	bread; cheese; and olives	bread, cheese, and olives
Between a subject and its verb	The oldest coins in the museum; are Roman.	The oldest coins in the museum are Roman.
Between a verb and its object	The divers found; huge stone blocks.	The divers found huge stone blocks.
Before a phrase or extra information	He met Hamdi; a sound engineer.	He met Hamdi, a sound engineer.
Together with a FANBOYS word between two sentences	The road was closed; so we walked.	The road was closed, so we walked. / The road was closed; we walked.
Before a word like such as / including	many tools; such as hammers	many tools, such as hammers
Around a word that only interrupts one sentence	The school; however, has a room.	The school, however, has a room.

Semicolon + FANBOYS. Between two complete sentences, choose one joining tool: a comma + FANBOYS or a semicolon alone. On the ACT, a choice with “; and”, “; but” or “; so” between two sentences is treated as wrong. The only place you will see “; and” in a correct answer is the SAT/ACT extra rule, before the last item of a list whose items contain commas.

What a semicolon does NOT do

A semicolon is not a choice about meaning. It does not “show contrast”, “show a result” or “add emphasis”. It only shows a boundary between two complete sentences (plus the SAT/ACT list rule). If you need contrast, the words do that job (but, however, yet), not the semicolon.

السيميكولون في جملة واحدة

السيميكولون (;) زي النقطة بالظبط: قبله جملة كاملة وبعده جملة كاملة، والجملتين مرتبطين ببعض. لو ينفع تحط نقطة، يبقى ينفع سيميكولون. ولو قبله أو بعده جزء ناقص (زي because أو such as أو قائمة) يبقى غلط.

however والقائمة

لو however في أول الجملة التانية: سيميكولون قبلها وفاصلة بعدها. ولو جوه جملة واحدة: فاصلة قبلها وفاصلة بعدها. وفي SAT/ACT بس: لو كل عنصر في القائمة فيه فاصلة، نفصل بين العناصر بسيميكولون، حتى قبل and الأخيرة.

Worked examples

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

Worked example 1. “The museum stayed open until midnight, this allowed families to visit after work.”

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

A) NO CHANGE
B) midnight this
C) midnight; this
D) midnight; and this

Answer: C.

C is correct. “The museum stayed open until midnight” and “this allowed families to visit after work” are both complete sentences. A semicolon joins them.
A is a comma splice.
B is a run-on.
D uses a semicolon and “and” together; choose one joining tool, not both.

Worked example 2. “The first test of the new pump failed, consequently, the engineers redesigned the valve.”

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

A) NO CHANGE
B) failed; consequently, the
C) failed, consequently the
D) failed consequently; the

Answer: B.

B is correct. “consequently” begins the second complete sentence, so a semicolon goes before it and a comma after it.
A and C are comma splices: “consequently” is not a FANBOYS word, so a comma cannot join the two sentences.
D puts the semicolon after “consequently”, which leaves “The first test of the new pump failed consequently” and changes the meaning; the transition belongs to the second sentence.

Worked example 3. “Although the hall was small; the concert attracted more than two hundred people.”

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

A) NO CHANGE
B) small, the
C) small. The
D) small the

Answer: B.

B is correct. “Although the hall was small” is an introductory dependent clause, so it is followed by a comma.
A uses a semicolon after a dependent clause: the part before it is not a sentence.
C turns “Although the hall was small” into a fragment.
D leaves out the comma after the long introductory clause.

Worked example 4. “The summer programme will run in three cities: Alexandria, on the coast, Minya, in Upper Egypt, and Ismailia, beside the canal.”

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

A) NO CHANGE
B) Alexandria; on the coast; Minya; in Upper Egypt; and
C) Alexandria, on the coast; Minya, in Upper Egypt; and
D) Alexandria, on the coast; Minya, in Upper Egypt and

Answer: C.

C is correct (SAT/ACT extra rule). Each item is a city + a describing phrase separated by a comma, so semicolons must separate the items, including before “and”.
A uses only commas, so the reader cannot tell whether there are three items or six.
B puts semicolons inside the items too, cutting each city off from its description.
D drops the semicolon before “and”, so the last two items run together.

Classic traps

Semicolon + fragment: a dependent clause, a phrase or a list on one side of the semicolon.
Semicolon before a list: “three things; bread…” — after a complete sentence, a list needs a colon.
Comma + however: “…cloudy, however, the divers…” is still a comma splice.
Semicolon on the wrong side of the transition: “cloudy however; the divers…”.
Semicolon + FANBOYS between two sentences: “; and”, “; but”, “; so”.
Semicolons in a simple list whose items contain no commas.
Missing semicolon before the final “and” in a list whose items contain commas.

Fast strategy for test day

See a semicolon in a choice? Do the period test on both sides.
Two complete sentences and no FANBOYS word? Semicolon (or period). Never a comma alone.
A transition word (however, therefore…) at the boundary? Semicolon before it, comma after it.
A list? Simple items → commas. Items that contain commas → semicolons (SAT/ACT extra rule), including before “and”.
Eliminate any choice that combines a semicolon with and/but/so between two sentences.

Practice

Two short ACT-style essays, one informational and one argumentative, with 5 questions each. The numbers in brackets match the question numbers. Every question tests a semicolon decision from this page.

Remember

A semicolon joins two complete, closely related sentences: if a period works, a semicolon works.
With a conjunctive adverb: sentence; however, sentence. A comma alone before however is a comma splice.
SAT/ACT extra rule: semicolons separate list items that already contain commas, including before the final “and”.
Never a semicolon next to a fragment: not after because/although clauses, not before a list, a phrase or such as.
Never a semicolon + and/but/so between two sentences — choose one joining tool.

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