if的虛擬語氣用法 if三大虛擬語氣公式

【if的虛擬語氣用法 if三大虛擬語氣公式】1、提出將來會發生的事:主句:主語+would/should/might/could+動詞原形;從句:should+動詞原形/were to+動詞原形 。例句:If he should go to Harvard University, he would make full use of his time.如果他要上哈佛大學的話 , 他就會充分利用他的時間了 。
2、提出現在的條件:主句:主語+would/should/might/could+動詞原形;從句:動詞過去式 。例句:If he studied at this school, he would know the enviornment around the school very much.如果他在這所學校學習的話 , 他會很了解周邊環境 。
3、提出過去的未發生的條件:主句:主語+would/should/might/could have+動詞過去分詞;從句:had+動詞過去分詞 。例句: If I had read the book, I would have told you about it.我如果看過本書 , 我會把內容告訴你了 。

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