It was exactly what I needed
That's when I decided.
兩句都是表語從句.
表語從句
在句子中起表語作用的從句叫做表語從句.表語從句的引導詞和主語從句的引導詞相同.
What the police want to know is when you entered the room.
警察想知道的是你什么時候進的房間.
The trouble is that we are short of funds.
困難是我們缺乏資金.
This is what we should do.
這是我們應當做的.
That's why I want you to work there.
那就是我要你在那兒工作的原因.
His first question was whether Mr.Smith had arrived yet.
他的第一個問題是史密斯先生到了沒有.