1、可以接表语从句的连系动词有be, look, remain, seem等，引导表语从句的词有,从属连词，th锾攒揉敫at, weather, as though等，连接代词who, what, 连接副词when, where, why, how等等
3、例如，the trouble is that he has lost his money, 再例如，the question is whether we need more ice cream，问题是是否我们需要更多的冰淇淋
5、例如 ，the question is which of us should go, 再例如，the problem was who could do the work, 问题是谁可以做这项工作
