3．在宾语从句中 （1）在及物动词后面所接的宾语从句中，连词that 一般可以省略；但如果及物动词后面是由that引导的两个或两个以上的并列的宾语从句 ，那么只有第一个that可以省略。如：① I think (that) the reform of the renminbi's exchange rate is necessary. 我认为人民币兑换率的改革是必要的。 ② He said (that)the Anti-secession law had been passed and that President Hu Jintao had signed a presidential order 他说《反分裂国家法》已被通过，而且胡锦涛主席已签署了主席令。（2）由 which , when ,where , how,和 why 引导的 宾语从句，可以全部或部分省略。如： ① I know that NBA star Yao Ming will come to our city but I don’t know when (he will come to our city)我知道NBA明星要到我们城市来但我不知道他什么时候来② He wants to move abroad but his parents wonders why (he wants to move abroad)他想搬迁到国外但他的父母想知道为什么。
4．在与suggest ,request ,order ,advise 等词相关的名词性从句中，须用虚拟语气形式“should +动词原形”，should可以省略。如：Chirac, President of the Republic of France suggested that the China-France Culture Year (should) last long in various forms.法国总统希拉克建议中法文化年以各种各样的形式长期持续。
5．主句省略多用于句首。如：(It is a ) Pity that I didn’t go to Mary's birthday party yesterday.很遗憾，我昨天没有去参加玛丽的生日聚会。6．在答语中，主句可全部省略。如：—Why were you absent from school last Friday ?—(I was absent from school)Because my mother was ill. 上周五你为什么没有上学？ 因为我妈妈病了。
三、简单句中的省略
1．省略主语 1）祈使句中的主语通常被省略 如：(You) Open the door ,please. 2)其它省略主语多限于现成的说法 如： ① (I) Thank you for your help 谢谢你的帮助。 ② (It)Doesn’t matter.没关系。
2．省略主谓语或主谓语的一部分 如：①(There is) No smoking .禁止抽烟 ② (Is there)anything else ? 还有其它事吗 ？③ (You come)This way please.请这边走。 ④ (Will you) Have a smoke ? 抽烟吗 ？
3．省略宾语 如：—Do you know Mr. Li ? — I don’t know (him.)
4．省略表语 如：Are you thirsty ? Yes , I am (thirsty)5．同时省略几个成分 如：—Are you feeling better now? 你觉得好些了吗 ？—(I am feeling ) Much better (now) 好多了。(I wish) Good luck (to you) .祝你好运/祝你顺利。
四、动词不定式省略，只保留to 的场合
1．不定式作某些动词的宾语时，这些动词常见的有：love, like, care, wish, hope, expect, prefer, refuse, mean , try , oblige , advise , persuade , agree , want , afford , forget , remember , try , manage等。如：(1)（2000上海春）— You should have thanked her before you left . —I meant to ,but when I was leaving I couldn’t find her anywhere .你本该在离开前谢谢她，我本打算这么做，但当我就要离开的时候我却找不到她了。(2) You can do it this way if you like to .如果你想做，你可以这么做。
2．不定式作某些动词的宾语补足语或主语补足语时，这些动词常见的有：ask , tell ,advise, force, persuade, wish, allow, permit , forbid ,expect, order ,warn 等。如 ： (1) (NMET1995) The boy wanted to ride his bicycle in the street ,but his mother told him not to . (2) She wants to come but her parents won’t allow her to
3．不定式在句中作某些形容词的状语时，常见的形容词有 ：happy , glad ,eager , anxious , willing , ready 等。如： (NMET1995)— I will be away on a business trip .Could you mind looking after my cat ? — Not at all .I would be happy to