虛擬語氣可以用must嗎

must不用在虛擬語氣中

虛擬條件句：

條件狀語從句是非真實情況，在這種情況下要用虛擬語氣。

1．條件從句與現在事實不一致，其句型為：

句型1：If ＋主語＋過去時，主語＋ should (could， would， 或might) ＋動詞原形

If I were you， I would study hard.

If it rained， I would not be here now.

2．條件從句與過去事實不一致，其句型為：

句型2 : If ＋主語＋had＋過去分詞，主語＋ should（could， would， 或might）＋ have ＋過去分詞

If the doctor had come last night， the boy would have been saved.

If I had not studied hard， I would have failed in the exam last term.

3．條件從句與將來事實不一致，其句型為：

句型3：If ＋主語＋過去時/ should ＋動詞原形/ were to＋動詞原形，主語＋ should (could， would， 或might) ＋動詞原形

If it should rain tomorrow， we would stay at home.

If I were to go to the moon one day， I could see it with my own eyes.

If you missed the film tonight， you would feel sorry.