i沙命代理祖源境如顺细f的用法
的有关信息介绍如下: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.
如果你请他,他会来的。
2. (表示虚拟)假如,要是
1)时态:可以表示过去,现在和将来的情况。它的基本特点是时态退后。
a. 同现在事实相反的假设。
句型 : 条件础哪究买作进族分消缺用从句 主句
一般过去时 should( would) +动词原草生迅伟形
If they wer八协外省战周岩露煤模友e here, they would help you.
b. 表示于过去事实相反的假设。
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 succee掉钱固最氢补几ded.
The rice would no山若运是求质t have been burnt if you had been more careful.
If m打了倒左检y lawyer had been here last S地aturday, h比试e would have prevented me from going.
I磁停动让庆济抗f he had come yesterday, I shoul掉题深打过步d / would have told him about it.
含义:He did not come yesterday, so I d目兴村来功也武践困id not tell him about it.
If he had not been ill and missed many cl促频肥asses, he would have made greater progress.
含义: He was ill and missed man选血盟害副y lessons, so he did not make greater progress.
c. 表示对将来的假想
句型: 条件从句 主句
一般过去时 should+ 动词原形
we目神祖须及是散re+ 不定式 would + 动词原形
should+ 动词原形
If you succeeded, everything wou迅资张ld be all right.
If you should succeed, eve注争选千基菜局案便rything 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 wo市翻nder if she is ill.
不知她是否病了。