请把下面的句子组成定语重句

题目

请把下面的句子组成定语重句
1.Nobody understands the subject.
Nobody would say such a thing.
2.The passengens were still waiting.
They had to be transferred(转机）to another plane.
3.Do you know the reason?
I left early.

答案

1 Nobody who understanded the subject would say such a thing.
2 The passengers who had to be transferred to another plane were still waiting.
3 Do you know the reason why(for which) I left early?