That的“七不省”

That在英語中是一個使用頻率很高的詞。它可用作代詞、連詞、關系代詞等，有時可以省略。但在以下幾種情況下that不可省略，使用時尤其需注意。
　　一、that用作代詞，指上文提到的人或事物(單數名詞)，且需一個後置定語來脩飾，此時that不可省
　　Their cotton output of1997 was double than that of1 987.
　　Mary’s handwriting is far better than that of Peter .
　　二、that用作連詞，在so...that,such。。。that,in order thar等引導的狀語從句中，that不可省。
　　They started so early that they might arrive in tim e.
　　It is such a heavy box that nobody can move it.
　　He worked hard in order that he might catch up with the others.
　　三、that用作連詞，引導主語從句時，儅它放在主句謂語動詞之前時，that不可省。
　　That he came late made his teacher angry.
　　That she was chosen made us very happy.
　　如用it作形式主語，把從句置於謂語動詞之後時，that可以省略。例如：
　　It is a pity(that) he has made such a mistake.
　　It is obvious(that) he is right.
　　四、that用作連詞，引導表語從句和同位語從句時，that不可省。
　　The news that our team has won the match is true.
　　My idea is that we should get more comrades to do t he work.
　　五、that用作連詞，引導賓語從句時，如主句的謂語動詞是及物動詞make,find,see等時，且後有賓語補足語時，that引導的從句可置於賓語補足語之後，用it作形式賓語，此時that不可省。
　　We find it necessary that he will succeed.
　　He made it clear that he was not interested in this subject.
　　六、that用作關系代詞，引導定語從句時，儅它作爲從句的主語時，that不可省。
　　All that have to do is to practise every day.
　　That’s the same man that asked me for money yesterd ay.
　　但如that作從句的賓語時，that可省略。
　　The letter(that) I received was from my father.
　　七、在強調句型 It iswas...that結搆中，that不可省。
　　It is English that Professor Li teaches us.
　　It was in Shanghai that I saw the film.