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1、当要用动词相关的动作作主语时,动词要用+ing形式.Smoking is bad for your health.用动词原形的几情况1.加助动词do, does或did 的肯定句变成否定句时，其后面的动词要用动词原形;He didn’t work hard at English last term.2.情态动词后面要用动词原形; Must I be at home tonight?3.be going to, will, shall 等构成的将来时态，其后面的动词要用动词原形;There will be on a new interesting film at the cinema.4.祈使句要用动词原形;Be careful, Lin tao!5.let开头的祈使句，其后面的动词要用动词原形; Let’s have a look at the pictures.6.had better 后面要用动词原形; you’d better put on more clothes. It’s very cold outside.7.why not 之后要用动词原形; Why not come a little earlier?= Why don’t you come a little earlier?8.动词不定式to之后要用动词原形; Please give me something nice to eat.9.feel, hear, see, watch 等感官动词之后要用动词原形。
2、如果表示这一动作正在进行，就用现在分词。
3、Sometimes we can hear a girl sing in the room.I feel my left leg hurting badly.那些都是我自己总结的,仅你参考.。
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