what is a clause?
Clauses are units of grammar that contain at least one predicate (verb) and a subject. A clause, therefore, contains a single verb group. A clause is different than a phrase. A clause is a group of words with a verb and a subject. Instances of the same can be seen in italics in the following sentences:
* He has a chain which is made of gold.
* The train had left by the time they reached.
* I belong to a family which has fifteen members.