if的用法总结 (英语)


1.(表示条件)如果 ,主句用将来时,if从句用现在时表示将来

He will come if you invite him.





句型 :条件从句 主句

一般过去时 should( would) +动词原形

If they were here,they would help you.


句型:条件从句 主句

过去完成时 should(would) have+ 过去分词

If she had worked harder,she would have succeeded.

The rice would not have been burnt if you had been more .

If my lawyer had been here last Saturday,he would have prevented me from going.

If he had come yesterday,I should / would have told him about it.

含义:He did not come yesterday,so I did not tell him about it.

If he had not been ill and missed many classes,he would have made greater progress.

含义:He was ill and missed many lessons,so he did not make greater progress.


句型:条件从句 主句

一般过去时 should+ 动词原形

were+ 不定式 would + 动词原形

should+ 动词原形

If you succeeded,everything would be all right.

If you should succeed,everything would be all right.

If you were to succeed,everything would be all right.

3. = whether 连接宾语从句

I wonder if she is ill.


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