It is necessary……引導的句型后面什么時候用虛擬語氣,什么時候用不定式?It is necessary……引導的句型后面什么時候用虛擬語氣,什么時候用不定式?

熱心網友

A）It is necessary + that ... 的結構中的that引導主語從句的謂語動詞要用虛擬語氣，即 should + 動詞原形，其中的should 可省略。e.g. It is necessary that we (should) hold a meeting tomorrow.B）在不定式作形容詞的主語的句式中，It is necessary + 不定式e.g. It is necessary for you to lock the car when you do not use it.

熱心網友

It is necessary that.....(虛擬語氣）It is necessary for sb to do sth