很高興為您
It's one of the important problems to be solved tomorrow 名詞后非謂語(yǔ)用to be done
to be done 一般表示 “有待被做”,動(dòng)作未發(fā)生,并且是被動(dòng)語(yǔ)態(tài).因?yàn)椴欢ㄊ叫揎椀膒roblem不能自己解決,只能被解決,所以用被動(dòng) to be solved.
He is looking for a place to live in.
to live in 賓補(bǔ),主語(yǔ)是he,與動(dòng)作間是主動(dòng)關(guān)系,所以用主動(dòng)語(yǔ)態(tài)的不定式to do.
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