it takes him two hours to finish doing his homework为啥用doing?不是it takes sb.sometime to do sth

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ittakeshimtwohourstofinishdoinghishomework为啥用doing?不是ittakessb.sometimetodosthittakeshimtwohourstofi

it takes him two hours to finish doing his homework为啥用doing?不是it takes sb.sometime to do sth
it takes him two hours to finish doing his homework为啥用doing?不是it takes sb.sometime to do sth

it takes him two hours to finish doing his homework为啥用doing?不是it takes sb.sometime to do sth
“it takes him two hours to finish ”用的是it takes sb.sometime to do sth
而finish后面用动词ing形式 finish doing sth

对呀,是to do something.但do 是 finish。doing是动名词,来表示something部分

finish是介词,后+ing

finish就是动词原型。
finish + doing 完成做某事

take sb to do 的to 用在了finish上了,doing是因为finish doing sth 。
希望对你有用!