The Semicolon Trap
A Grade 6 student, Émile, is revising a short narrative about a camping trip. His draft contains the following sentences: 'The fire crackled softly; the stars appeared one by one. We roasted marshmallows and told stories, it was the best night of the trip. My sister wanted to hike to the lake but it was too dark. We decided to stay by the fire, and we were glad we did.' His teacher has marked two sentences as needing correction but has not said which ones. The class has studied compound sentences, coordinating conjunctions (for, and, nor, but, or, yet, so), and the semicolon as a way to join two closely related independent clauses. Émile thinks the first sentence is wrong because it uses a semicolon instead of 'and.' He also thinks the third sentence is wrong because it uses 'but' without a comma. He wants to fix the sentences before the final draft is due at the end of the period.
1. Identify which two sentences actually need correction and explain the grammar rule that applies to each. Then explain why Émile's assumptions about the first and third sentences are incorrect.
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The two sentences that need correction are the second and the third.
The second sentence, 'We roasted marshmallows and told stories, it was the best night of the trip,' contains a comma splice: two independent clauses joined only by a comma. It should be fixed with a semicolon ('...told stories; it was the best night...'), a coordinating conjunction ('...told stories, and it was...'), or a period ('...told stories. It was...').
The third sentence, 'My sister wanted to hike to the lake but it was too dark,' joins two independent clauses with 'but' but lacks the comma that should precede the coordinating conjunction when both sides are independent clauses. It should read '...to the lake, but it was too dark.'
Émile's assumption about the first sentence is incorrect. 'The fire crackled softly; the stars appeared one by one' correctly uses a semicolon to join two closely related independent clauses. A semicolon is not a mistake here, and replacing it with 'and' is optional, not required. His assumption about the third sentence is partly right but for the wrong reason: the problem is not that 'but' is used, but that the comma before 'but' is missing. The fourth sentence, 'We decided to stay by the fire, and we were glad we did,' is correctly punctuated because it uses a comma plus a coordinating conjunction between two independent clauses.
2. Émile wants a reliable way to check compound sentences in his own writing. Describe a step-by-step check he can apply to each sentence and demonstrate it on one correct and one incorrect sentence from his draft.
Read the worked answer
A reliable check has four steps. First, find the conjunction or punctuation mark that joins the parts. Second, test whether each side can stand alone as a complete sentence (subject plus verb plus a complete thought). Third, if both sides are independent, check that they are joined by a comma plus a coordinating conjunction, a semicolon, or a period. Fourth, if one side cannot stand alone, check that no comma is used before the conjunction unless another rule requires it.
Demonstration on a correct sentence: 'We decided to stay by the fire, and we were glad we did.' The joining word is 'and.' Left side: 'We decided to stay by the fire' can stand alone. Right side: 'we were glad we did' can stand alone. Both are independent, and they are joined by a comma plus 'and,' so the sentence is correct.
Demonstration on an incorrect sentence: 'We roasted marshmallows and told stories, it was the best night of the trip.' The joining mark is a comma. Left side: 'We roasted marshmallows and told stories' can stand alone. Right side: 'it was the best night of the trip' can stand alone. Both are independent, but they are joined only by a comma, which is a comma splice. The fix is to change the comma to a semicolon or add 'and' after the comma. This check is quick and can be applied to every compound sentence in his draft before he submits it.