Which of the following describes the difference between a clause and a phrase?

Question

1. A clause occurs at the beginning of a sentence, but a phrase does not.
2. A clause has a subject and verb, but phrase does not
3. A clause has commas around it or after it, but a phrase does not
4. A clause modifies another word in the sentence, but a phrase does not

Answer 1

2. A clause has a subject and verb, but a phrase does not.