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英语句型中什么时候用do sth,to do sth,doing sth或 to doing sth

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英语句型中什么时候用do sth,to do sth,doing sth或 to doing sth
英语句型中什么时候用do sth,to do sth,doing sth或 to doing sth
1.(Do some sports) and you will feel better.
祈使句(do sth.) + and + 陈述句
2.Do some sports (to be healthier).
括号中动词不定式说明目的.
3.doing sth.要么是动名词,要么是现在分词.
Watching TV sometimes is boring.
Seeing from the top of the tower,we find our city so beautiful.
4.to doing sth.就是动名词作介词to的宾语.to在很多时候都加动词原形构成动词不定式,而在类似look forward to 这样的短语后面跟动词的时候就用 doing .比方说 I am looking forward to meeting you.