Grammar · ACT

ACT English Rules

Core grammar, punctuation, and rhetorical skills rules tested on the ACT English section.

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When should you use a comma to separate items in a series?
Use a comma between each item, including before the final 'and' (the Oxford comma).
What punctuation is required when joining two independent clauses with a coordinating conjunction?
Place a comma before the coordinating conjunction (and, but, or, nor, for, yet, so).
How should you punctuate an introductory phrase followed by an independent clause?
Place a comma after the introductory phrase.
Should a comma separate a subject from its verb?
Never. Never place a comma between a subject and its verb.
How should a non-restrictive clause be punctuated?
Set it off with commas on both sides because it provides extra, non-essential information.
When can a semicolon join two sentences?
A semicolon can connect two independent clauses when they are closely related in meaning.
What is parallel structure?
Items in a series, list, or comparison must use the same grammatical form or structure.
What is a sentence fragment?
An incomplete sentence that lacks a subject, verb, or independent clause and cannot stand alone.
What is a comma splice?
Joining two independent clauses with only a comma, without a coordinating conjunction or semicolon.
What is a dangling modifier?
A phrase that appears to modify the wrong word because the intended subject is missing or unclear.
How should you correct a misplaced modifier?
Move the modifier close to the word it is intended to describe.
What is the difference between 'their,' 'there,' and 'they're'?
'Their' is possessive, 'there' indicates a place, and 'they're' is the contraction of 'they are'.
What is the difference between 'its' and 'it's'?
'Its' is possessive, and 'it's' is a contraction of 'it is' or 'it has'.
When should you use 'who' versus 'whom'?
Use 'who' as the subject of a clause and 'whom' as the object of a verb or preposition.
What is the difference between 'affect' and 'effect'?
'Affect' is typically a verb meaning to influence; 'effect' is typically a noun meaning a result.

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