Subordinate clauses are of three kinds:
Read the sentences in the passage:
Kamal is a son of a poor father who works in the town. He knows that his father earns by working hard. He often goes to the place where his father works. It was on a holiday when he went to see his father. As his father was busy, he waited there. He waited in the workshop until his father stopped working. His father came out when it was quite dark. Now they began to walk fast so that they could catch the train. They walked fast lest they should miss the train. Kamal could not walk as fast as his father could. Though the road was not visible clearly, they were walking fast. They reached the station at the time when the train was just going to leave.
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Now let's know more about subordinate clauses in the next section!