16Hit1600
Standard English ConventionsMediumJoining clauses with a coordinating conjunction

Standard English Conventions practice question

Which choice completes the text so that it conforms to the conventions of Standard English? The first experiment failed ____ the team still learned which variable to change next.

  1. A. failed, butCorrect
  2. B. failed but,
  3. C. failed but
  4. D. failed. But,

Answer: A. failed, but

Two independent clauses joined by the coordinating conjunction 'but' take a comma BEFORE the conjunction: 'failed, but'. The comma goes before 'but', not after it (choice B).

Why the other answers are wrong

B. failed but,
You used the right conjunction but put the comma on the wrong side: with two independent clauses, the comma goes before 'but,' not after it.
C. failed but
'But' alone isn't enough here — both halves are complete sentences, so the coordinating conjunction needs a comma in front of it.
D. failed. But,
Even if you split the clauses into two sentences, 'But,' with a comma after it is wrong; the comma belongs before the conjunction in a single sentence.

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