『壹』 定語從句中that什麼情況下可以省略
①悶逗派that在定語從句中作賓語或介詞賓語時可省略
He is reading the book (that) he bought yesterday. 他在讀他昨天買的書。
②that作從屬連詞，在句子中沒有實在意義，只起到連接作用，以引導賓螞賀語從句時，也可以省略。
We are sure (that) we can have a better and cleaner place in the future.
我們相信，我們可以有一個更加美好，更清潔的地方。
③so that … 結果狀語從句中的省略
The sound is so weak (that) you cannot hear it. 聲音弱得你聽不見。
(1)定語從句中that什麼時候可以省略擴展閱讀
由which, that引導的從句
它們所代替的先行詞是事物的名詞或代詞，在從句中可指型作主語、賓語等，作賓語時可以省略，例如：
1、Prosperity which / that had never been seen before appears in the countryside. 農村出現了前所未有的繁榮。（which / that在從句中作主語）
2、The package (which / that) you are carrying is about to come unwrapped. 你拿那個包裹快要散開了。(which / that在從句中作賓語）
注意： 代表物時多用which，但在下列情況中用that而不用which：