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It's useful knowing several languages.为何用knowing不用to know

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It's useful knowing several languages.为何用knowing不用to know
It's useful knowing several languages.为何用knowing不用to know
knowing :动名词,表示已经存在或者已知的事情.
to know ,表示要做的,未发生的.
It's useful knowing several languages.懂多种语言是很有用的.（已经懂多种语言）
It's useful to know several languages. （如果能）懂多种语言是很有用的.（不确认已经懂多种语言）
Knowing several languages-----(help)him to make friends acro to know 和knowing有什么区别? 红线,48,用knowing还是to know It's been a pleasure knowing you. not knowing how to do it,______ Knowing what I know nice knowing you.nice to have know you的区别 Knowing what I know is not useful for you.这句话所有成分的分析. Knowing what I know is not useful for you,这句话konwing是什么词性,wh 书上有个选择题（ ）I am,it is useful to know foreign languages答案是what I knowing it is not easy?还是I know it is not easy? I'd like _something about you.A .to know B.knowing C.know D.