A subordinate clause, like a phrase, is a group of words used as a part of speech, the chief difference being that a clause must have a subject and a predicate. Clauses are introduced
1. By relative pronouns:
who, whose, whom, which, what, that
2. By subordinate conjunctions:
| when | because | than | unless |
| where | since | provided | till |
| while | if | whereas | until |
| as | as soon as | wherever | before |
| as if | as long as | whether | after |
| though | in order that | why | for |
| although | lest | that | whenever |
Illustrations
| Adjective: |  | A lamp that smokes |  | is a torture to a student. |
| A smoking lamp |
| Adverb: |  | When she was good |  | she was very, very good. |
| Sometimes | ||||
| When she was bad | she was horrid. | |||
| Sometimes |
Does the clause or the simple adverb give the more definite idea?
| Noun: I know | | where he lives. |
| the house. |