知识点1:什么是条件状语从句
引导条件状语从句的从属连词
主要的有if, unless, as [so] long as等:
You can leave now if you like. 如果你愿意现在就可以走了。
As long as it doesn't rain we can go. 只要不下雨,我们就可以去。
【注】除以上基本的引导条件状语从句的从属连词外,还有的动词尤其是其分词形式(如suppose, supposing, provided, providing等)和介词短语(如in case, on condition that等)也可用作连词表示条件:
[1]on condition that,状语从句,相关知识点on condition that引导的状语从句(含虚拟条件句)二、连用虚拟语气这类虚拟语气主要由 should + 动词原形 构成。如:He can use the bicycle on condition that he should return it tomorrow. 如果他明天能还回来,就可以借用这辆自行车。——摘自《薄冰高级英语语法》I reluctantly a
In case I forget, please remind me about it. 万一我忘记,请提醒我一下。
I will come on condition (that) she is invited too. 如果邀请她来, 那我就来。
He may go with us provided [providing] he arrives in time. 他若及时到,就可以和我们一起走。
Suppose 和supposing 引导条件状语从句时,通常用于主句为疑问句的场合:
Suppose the boss saw you,what would he say? 如果老板看到你,他会怎样说?
Supposing he does not come, shall we go without him? 他若不来,是不是不带他去?
[2]without单词记忆法◆记忆方法一:联想方式:with一起;out出去本来在一起的都出去了-没有◆记忆方法二:联想方式:with一起;out出去记忆方法:本来在一起的都出去了-没有
条件状语从句的时态
[3]状语从句,时态,相关知识点as soon as所引导的状语从句中应使用一般时态表示将来。[误] I'll give him the note as soon as he will come.[正] I'll give him the note as soon as he comes.[析] as soon as所引导的状语从句中应使用一般时态表示将来。
当主句为将来时态或具有将来意时,条件状语从句通常要用一般现在时表示将来意义,而不能直接使用将来时态:
[4]一般现在时,状语从句,相关知识点as…as引导的状语从句中可以用一般现在时表示将来。[误] I'll call you as long as the book will be returned.[正] I'll call you as long as the book is returned.[析] as…as引导的状语从句中可以用一般现在时表示将来。
I'll stay at home if it rains tomorrow. 要是明天下雨,我就呆在家里。
【注】有时也可见到 if you will 这样的说法,但那不是将来时态,而是表示意愿或委婉的请求(此处的 will是情态动词):
[5]will,情态动词,相关知识点情态动词shall/will的意义和用法情态动词shall/will的意义和用法1. shall 和will都表示将来行为或想法时,shall一般只用于第一人称;而will在现代英语中,可用于任何人称;如:I shall / will go there with you. 我将跟你一起去那儿。He will come here soon. 他马上就要来了。2. 表示意志时,sh
If you will wait for a moment, I'll go and tell the manager that you are here. 请等一下,我去告诉经理说你来了。
知识点2:虚拟语气在条件状语从句中
[6]虚拟语气,从句,相关知识点-ever从句一定要用虚拟语气吗-ever从句一定要用虚拟语气吗在whatever, whichever, whenever, whoever, wherever, however, no matter…等引导的让步状语从句中,从句谓语通常用陈语气,但有时也用虚拟语气。用虚拟语气主要表示不确定或没有把握等,这类用法主要有以下两类句式:1. 使用may指现在或将来,谓语用“may

条件状语从句主句
If + 主语 + 动词过去完成式主语 + would, should, could, might+have + 过去分词
[7]主语,动词,相关知识点知识点1:“动词+间接宾语+直接宾语”改为被动时,可以用间接宾语做被动句的主语。如:His teacher gave him a dictionary.—He was given a dictionary by his teacher.(老师给他一本字典—他得到老师一本字典)也可以用直接宾语做被动句的主语,但是需用to或者for引出原句的间接宾语。如:His teacher g