Answer:
1- Whoever wants to help
2. Who is behind the counter
3. When i press the button
Explanation:
Dependent clause  cannot stand as a sentence by itself. It must be combined with one or more independent clauses to form a sentence.
Dependent clauses can function either as noun clauses, adjective clauses, or adverb clauses in a sentence. A dependent clause begins with words such as after, although, because, before, if, since, that, until, what, when, where, who, which, and why.
