dont后接动词原形do sth;
同理，第三人称单数形式doesnt后也接动词原形do sth.因为第三人称单数形式的数的变化已经体现在助动词does了。
don't：do not 的常用口语形式
例句：
Don't try to put one over on me!
你甭想蒙我！
Do what you like ─ I don't care.
你想做什么就做什么——我不在乎。
You think you're really hard, don't you?
你是不是以为自己真的很勇猛？
You don't need to leave yet, do you?
你不必现在就走吧？
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