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why not do sth固定句型,have后面的动词是不是用原形那样分情况了I have finished my homework.I have a lot of homework to do.不是过去式没太明白你到底想问什么like后面动词是不是用ing形式不一定呀like to do sthlike doing sth都可以呀第三人称单数 像has 多一点你能问题写得清楚一点嘛？搞不清你想问什么