2.3 非谓语动词，状语从句和独立结构1） Having done their homework， the children began to play. （分词作状语）

　　2） After having done their homework， the children began to play. （连词+分词）

　　3） After they had done their homework， the children began to play. （状语从句）

　　4） With homework done， the children began to play. （独立结构）

　　2.4 非谓语动词作定语1） If there is no choice， there is no decision ___ （make）。 （to be made）

　　2） Do you know the man ____ （ stand） in front of the house？ （standing）.

　　3） The question ____ （discuss） at the moment is very important. （being discussed）

　　4） The bridge ____ （build） in the 1950s is still in good condition. （built）

　　2.5 动名词和动词不定式作主语和表语动名词作主语/表语表示一般、抽象的情况；动词不定时作主语表示具体某次的情况。

　　Rising early is good for health. To rise early tomorrow is difficult for me. It is difficult for me to rise early tomorrow. My biggest wish is to go abroad. Seeing is believing.

　　作宾语接动名词作宾语的动词：admit， acknowledge， avoid， appreciate， consider， delay， enjoy， escape， excuse， forgive， finish， include， involve， mind， put off， postpone， suggest， feel like， look forward to， be used to， be accustomed to， etc.接动词不定式作宾语的动词：want， tend， intend， pretend， hope， plan， expect， be supposed to， seem， be likely to， used to， be willing to， desire， force， prefer， start， begin

　　接动名词和动词不定式有不同含义的动词：1） forget， remember， regret 2） stop， continue 3） need/ want 4） allow doing/ allow sb to do

　　（1） How can I forget meeting you for the first time？

　　Sorry， I forgot to lock the door.（2） I can‘t stop laughing. Can you stop to give me a hand？

　　（3） The grass needs cutting. The grass needs to be cut.（4） We don‘t allow smoking here. You are not allowed to smoke here.

　　3.虚拟语气

　　第一大类：非真实条件下的虚拟语气

时间  从句  主句  与现在事实相反  did/ were  should/could/would + do  与过去事实相反  had done 

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