If you want to add extra information that is not essential to a sentence, the extra information should be separated from the rest of the sentence by a comma. To test if the information is essential to the understanding of the sentence or not, read the sentence without it.
- Audrey, who is very tired, is going on holiday next week.
(The commas before and after who is very tired are needed because this information is not essential to the sentence.)
Audrey is going on holiday next week.
(With the information deleted the sentence is still understandable.) - He failed his driving test, which wasn’t surprising.
(The comma after driving test is needed because this information is not essential to the sentence.) - Our hotel, which only had eight rooms, was fantastic.
Now do Use commas when adding extra information · exercise 1
