657　That is what

◎ 本句型意为“这就是……所……”，what 引导的是表语从句。也可以说：that is when（这就是……的时候），that is where （这就是……的地方），that is how（这就是……如何……的）等。

That's exactly what I want to say. 那刚好是我想说的。

That's how he fell into their trap. 他就是那样落入他们的圈套的。

That's where you are wrong. 这就是你出错的地方。

That's why she quitted her job. 那就是她为什么辞了职。