Grammar GuideCommaShould I use a comma before "since"?

Should I use a comma before "since"?

Should I use a comma before "since"?

When "since" is used as a preposition, it doesn't need a comma:

  • I haven't seen him since breakfast.
  • I've long since forgotten what the hotel was called.
  • He had held a grudge ever since.

Sometimes "since" can be used as a subordinating conjunction in place of "because". If it starts a dependent clause after the main clause, it shouldn't be preceded by a comma:

  • She bought more gloves since she was always losing them.

However, if the independent clause that comes before "since" contains a negative verb, you need a comma:

  • He couldn't go to the convention, since he was needed at home.

Common Questions about Comma

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