作业帮1．us与our区别2．什么是被动语态3.if 要如何用?
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1．us与our区别2．什么是被动语态3.if 要如何用?
1．us与our区别
2．什么是被动语态
3.if 要如何用?
1．us与our区别2．什么是被动语态3.if 要如何用?
1 us:[ us ] we的宾格
our:[ 'auə ] pron.我们的
2 被动语态：宾语+is/are/was/were+动词的过去分词+by +主语
3 If:
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 ：条件从句 主句
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.
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 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
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.
是否 = whether 连接宾语从句
I wonder if she is ill.
不知她是否病了.
介词后用宾格，us就能用
our后跟名词
our 用在开头
us 用在动词的后面
us是我们，一般用于宾语位置
our是我们的