Does this sentence need a comma before “which”?

The sentence of interest:

She wasn’t able to send the pictures to you earlier due to technical difficulties with her phone which took an unusually long time to resolve.

When is it appropriate for a comma to precede the word “which,” and is the sentence above correct?

Thanks in advance.

  • 1
    Yes, this needs a comma. It’s a non-restrictive relative clause.
    – Xanne
    Apr 23 '20 at 2:47
  • If it's nonrestrictive, and if it's US English, then a comma is needed. If it's restrictive, and it's US English, then which should be replaced with that. (In UK English, both which and that are commonly used with restrictive clauses.) So, you need to first determine if it's restrictive or nonrestrictive. Apr 23 '20 at 5:35
  • Note: It's quite possible that it's a restrictive clause. She could have two phones, one with problems that took an unusually long time to resolve, and another that had no problems at all. It's restrictive if you have to specify the phone in question. Apr 23 '20 at 5:37
  • 1
    Does this answer your question? Is it appropriate to put a comma before "which"? Apr 23 '20 at 5:40
  • @JasonBassford The referent is, I think, technical difficulties, not her phone.
    – Xanne
    Apr 23 '20 at 8:04

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