如上文那样宾语是专有名词时，that 要比 who 更常用。用于指其他一切宾语时，that 是正确的：
It's the manager that we want to see．
我们要见的是经理。
It was wine that we ordered．
我们要的是红葡萄酒。（不是啤酒）
that 常用于指非人称主语：
It's speed that causes accidents，not bad roads．
造成车祸的常是超速行驶，而不是路况不好。
You can memorize words in an efficient way if you pronounce them reasonably. Say words correctly, and you will learn them easily. Correct pronunciation means correct spelling of the words. English spelling is not good to guide its pronunciation. But spelling and pronunciation have closed relationship. They match each other perfectly. Sometimes we can pronounce a word according to its spelling. English pronunciation can also guide its spelling. This is a two-way communication.
