導讀If引導的句子◎If引導的條件狀語從句，從句用一般現在時態，主句用將來時態，今天小編就來說說關于if英語用法總結?下面更多詳細答案一起來看看吧!if英語用法....

If引導的句子◎If引導的條件狀語從句，從句用一般現在時態，主句用將來時態，今天小編就來說說關于if英語用法總結?下面更多詳細答案一起來看看吧!

if英語用法總結

If引導的句子

◎If引導的條件狀語從句，從句用一般現在時態，主句用將來時態

If it is fine tomorrow I will go to the park.

◎if 引導的虛擬語氣

1.與現在事實相反：從句用過去時態（be動詞一律用were）主句用would 動詞原形

If you knew everything,you would not be so angry with him.

If i were you I would not be confident

2.與過去事實相反：從句用過去完成時，主句用would 現在完成時

If I had known his telephone number,I would have telephoned him

練習

1.if a train entered this tunnel,it (draw)in fresh air behind it

2.if you had told me about it earlier,I (be able)to help you

3.if you (come)with us ,we would have been pleased

4.you (not make) such a mistake if you had been more careful

5.if father (be) alive,he would be horrified

6. If it (not rain )tomorrow，we will go there by bike.

7. If it is fine tomorrow ,I ( go) to the park.