There are as many clauses in a sentence as there are finite verbs. A finite verb has a subject. Infinitives, participles and gerunds are not finite verbs.

For and because

Constructing a sentence having a noun clause is very simple. One of the easiest ways is to begin a sentence like this:

He said that…

A noun clause acts like a noun. It can serve all the purposes a noun serves in a sentence. In the following examples we are comparing the five functions of a noun with that of a noun clause. The sentences are patterned on a similar fashion, but in the first one we have used a noun and in the second one we have used a noun clause.

A compound sentence has two or more coordinate clauses. Hence it can be formed only with the help of coordinating conjunctions.

By using and, both…and, as well as and not only…but also

Forming a complex sentence with a relative adverb

These clauses are usually connected to the main clause by the relative adverbs when, where and why.

A complex sentence has at least one main clause and one or more subordinate clauses. The subordinate clause may be a noun clause, an adjective clause or an adverb clause.