City University of Hong Kong CLASS CLASS
Making Sense of Grammar
+3 votes
asked Mar 11, 2019 in Questions about English Grammar by 118070100217XX (400 points)

1 Answer

0 votes

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.
2. (表示虚拟)假如,要是

a. 同现在事实相反的假设。
句型 : 
一般过去时 should( would) +动词原形
If they were here, they would help you.

b. 表示于过去事实相反的假设。
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 careful.
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.

c. 表示对将来的假想
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. 是否 = whether 连接宾语从句
I wonder if she is ill.

answered Mar 14, 2019 by 118070100115lj (380 points)
766 questions
995 answers
5,496 users