Her trouble is that she doesn't know how to improve her teaching work.

　　他的苦恼是不知道怎样来改进教学工作。

　　That's just what I want. 这正是我想要的。

　　This is where our problem lies. 这就是我们的问题所在。

　　That is why he didn't come to the meeting. 那就是他为什么不到会的原因。

　　It looks as if it is going to rain. 看上去天要下雨了。

　　注意：当主语是reason 时，表语从句要用that 引导而不是because。例如：The reason why he was late was that he missed the train by one minute this morning.

　　他迟到的原因是因早上差一分钟没赶上火车。

　　2．名词性从句用作宾语叫宾语从句。引导宾语从句的关联词与引导主语从句、表语从句的关联词大致一样，在句中可以作谓语动词或介词及非谓语动词的宾语。

(1)由连接词that引导的宾语从句

由连接词that引导宾语从句时，that在句中不充当任何成分，在口语或非正式的文体中常被省去；但从句是并列句时，第二个分句前的that不可省。例如：

He has told me that he will go to Shanghai tomorrow.

他已经告诉我他明天要去上海。