Domain 4 | Joining Two Complete Sentences: Period, Semicolon, or Comma + FANBOYS
Start from zero: learn to tell whether a group of words is a complete sentence, then master the three legal ways to join two of them (period, semicolon, comma + FANBOYS) and eliminate the two illegal ones (comma splice, run-on).
Lesson Review Available
Review the foundation notes with TTA Pro Mr.O before solving. If this skill drill is part of an anchor lesson, the notes stay available during practice.
Objective: You will be able to look at any Boundaries blank, decide whether the words on each side form a complete sentence, and use that single judgement to choose between a period, a semicolon, and a comma plus a coordinating conjunction — while eliminating comma splices, run-ons, fragments, and the transition-word placement traps the Digital SAT builds around them.
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