Definition of clause
Clause is the combination of words which sometimes gives complete meanings and sometimes not. If it is independent clause it gives complete meanings (that is why it is called independent), whereas dependent clause doesn’t give complete meanings. Clause is a bit different from sentence on account of the following.
Clause separated by comma
She said, “I shall be there at 2 o’clock positively.”
She said is dependent clause and its meanings are not complete till independent clause I shall be there at 2 o’clock positively is used with it. Both are separated by comma.
Clause separated by demonstrative
He confessed that he had lifted a car.
He confessed and he had lifted a car are two clauses and they are separated by that which is demonstrative.
Clause separated by conjunction
My cousin and his friend are going on picnic tomorrow.
The underlined word is conjunction and it separates two clauses.
There are FOUR clause oriented types of sentences.
It is just one-clause sentence, like;
It is the combination of two independent clauses (where both clauses give complete meaning), like;
They are the sentences which have one dependent (subordinate) and one independent (main) clause, like;
They are the sentences in which three clauses are used in which one must be dependent, like;
i. It’s very important (dependent clause)
ii. you should work harder this time (independent clause)
iii. soon you have to appear in exam (independent clause)