用法：
1、that作指示代詞
That is my book.那是我的書。
2、that作指示形容詞
We haven't found any solution to deal with that problem yet.我們?nèi)晕凑业浇鉀Q問題的辦法。
3、that作關(guān)系代詞引導(dǎo)定語從句
This is the sort of thing that Jeremy loves.這是杰里米喜歡的東西。
4、that作連詞
that可以作連詞引導(dǎo)各種名詞性從句，包括賓語從句、主語從句、同位語從句和表語從句。
1)that作連詞引導(dǎo)賓語從句
They have recommended that the site be closed and repaired. 他們建議將該處關(guān)閉并進(jìn)行維修。
2)that作連詞引導(dǎo)主語從句
That you will win the medal seems unlikely. 你想獲得獎牌看起來是不可能的。
3)that作連詞引導(dǎo)同位語從句
The idea that modern art can only be seen in museums is mistaken. 現(xiàn)代藝術(shù)只能在博物館才能見到的想法是錯誤的。
4)that作連詞引導(dǎo)表語從句
One problem is that I don't look any different from other people. 有一個問題是我看起來和其它人沒有任何不同。
that還可以作連詞引導(dǎo)結(jié)果狀語從句，閱讀時需要留意這個用法。
What was the matter with the fellow that he looked so happy? 那人怎么回事，看起來這樣高興?
5、that作副詞
that和this都可以作副詞，用于修飾形容詞或修飾另一個副詞，表示“這么，那么，如此，這般”的意思，如:
It's about that long. 它大約有那么長。