Concept 1

Identify and fix sentence fragments, run-ons, and comma splices.

Core Idea

A complete sentence needs a full thought, and two full thoughts cannot be held together by a comma alone.

Understanding

Rule: When ACT tests fragments, the trap is usually a dependent clause or a phrase that sounds finished because it is long. If the sentence starts with words like "because," "although," or "when," make sure a complete main clause follows.

When ACT tests run-ons, the issue is the opposite: two complete thoughts have been pressed together without the right connector or punctuation. Check whether each side could stand alone.

Question

Worked Example

Which choice best completes the sentence?

"Because the lab was short on freezer space, _____"

Select an answer to see the explanation