A 　动名词的构成和现在分词一样：动词加上ing 构成，下面是各种时态和语态的构成:

　Seeing is believing.
　Having solved this difficult question made her very sad.
　Being invited to the party is a great honor.
　Having been defeated by such a weak team has made the players very upset.

注意：

当动名词作主语时，谓语动词一定要用单数。

　False: Helping the poor are a good deed.
　Right: Helping the poor is a good deed.

　False: Having missed the early train have made her very worried.
　Right: Having missed the early train has made her very worried.

B 　顾名思义，动名词有双重功能。它既有名词的特点---可作句子的主语，动词和介词的宾语；也有动词的特点---可　　
　　以有自己的宾语和状语。
　

　　Winning the game yesterday 　was very difficult.
　　　　　　　主语 　　　　　　　　　　　谓语

　动名词winning的名词特点：作整个句子的主语。

　动名词winning的动词特点：有自己的宾语：game; 自己的状语: yesterday.

　　He admitted 　breaking the window yesterday.
　　　　谓语 　　　　　　　宾语

　动名词breaking的名词特点：作动词admitted的宾语。

　动名词breaking的动词特点: 有自己的宾语：the window; 自己的状语: yesterday.

　　He is thinking of 　studying law in America.
　　　　　　　　 介词 　　　宾语

　动名词studying的名词特点：作介词of的宾语。

　动名词studying的动词的特点：有自己的宾语：law; 自己的状语: in America.

C 　动名词的否定式是动名词加not（一般现在时：not doing, not being done; 现在完成时：having not done, having
　　not been done）.

D 　通常情况下，动名词的复合式是在动名词的前面加上名词或代词的所有格。

　Tom's smoking annoyed everybody.
　Her screaming surprised the guests.
　Do you mind my opening the window?

　* 在口语当中，动名词的复合式也可以在动名词的前面加上名词或代词的宾格。

　Do you mind me opening the window?

二 　不同的功能：

　动名词可作主语，宾语，表语，定语

A 作主语:

　Doing exercises in the morning is good for health.

　Being courteous is a manner everybody appreciates.

　Having sold dozens of this new product in an hour is a reward for their excellent team-work.

　注意：

　在一些约定俗成的用法中，常用it作形式主语，而把真正的主语---动名词放在后面。

　It is no use crying in the corner.
　It is no good objecting this plan.
　It is great fun sailing a boat.

B 作宾语:

　The thief denied stealing the girl’s purse.

　Students enjoy studying at Dalian Maple Leaf International School very much.

　He is deeply surprised at hearing the bad news.

　She is very proud of working at DMLIS.

　Bush insisted on attacking Iraq.

　注意：

　经常接动名词作宾语的动词有：admit, avoid, consider, delay, deny, dislike, enjoy, evade, fancy, finish,
　keep, mind, miss, postpone, give up, suggest, risk, resist.

C 作表语:

　My job is teaching English.
　The cleaner’s job in this hotel is tidying up everything in the room.

D 作定语:

　This train has three sleeping carriages.
　Iraq needs a peace-keeping troop to keep law and order.

　区别：

　1 There is a sleeping baby on the bed.
　2 There is a sleeping bed in the room.　

　第一个句子中的sleeping 是现在分词，因为我们可以说：the baby is sleeping.

　第二个句子中的sleeping 是动名词，因为我们不可以说：the bed is sleeping.