IF 从句 可以这样省略吗
状语从句可以省略主语+ be。
比如：I will help you if (it is) possible.
if最常见的用法，就是用来表达“假如、如果”的意思。if还有另外一个用法，那就是“是否”的意思，跟whether用法差不多，用于引出从句。
用法
if可引导让步状语从句,作“虽然,即使”解,常和even连用。
if可引导名词性从句,作“是否”解,常放在ask, doubt, know, learn, see, wonder等动词后。一般用在口语中,而且不能用于句首。
if可以表示惊奇或愤怒。用于陈述语气的否定句时,意义则是肯定的。
if引导条件状语句类及虚拟条件句判断 1、条件句两类： 1).真实条件句（Sentences of Real Condition）：凡假设情况发性能,真实条件句.例： ⑴、If I have time ,I will help you with this work.我间帮助做工作. ⑵、As long as I say anything wrong,you must point it out.要我说错,定要指. ⑶、If time permits,we'll go fishing together.(间,我起钓鱼.） 2).虚拟条件句（Sentences of Unreal Condition）：假设能实现,虚拟条件句.例： ⑴、If I were you ,I would have attended the meeting.我,参加议. ⑵、If he had 中国e here yesterday,he would have seen his old friend.假昨,看见朋友. ⑴、If it had rained yesterday,we would have stayed at home.（昨雨,我留家.） 2、.if条件状语句虚拟语气判断 判断真实条件句非真实条件句.非真实条件句才使用虚拟语气.通句意思,看假设条件否能够实现,能够实现真实条件句,能使用虚拟语气；假设条件能实现则非真实条件句,要用虚拟语气. 判断假设与哪事实相反.通三种情况：①与事实相反.②与现事实相反.③与事实能相反. 3、退步 退步指准确判断该句与哪事实相反,按虚拟语气退步处理句谓语词态.即：非真实条件状语句,谓语词按情况退步.： ①与事实相反,句用完形式表示. ②与现事实相反,句用般形式表示. ③与事实能相反,句用形式表示. 主句则用情态词would,should,could 等加与句致词形式.例： ⑴、If I had 中国e her yesterday,I would have seen him. ⑵、If I were a teacher,I would be strict with my students. ⑶、If it should snow tomorrow,they couldn't go out. 4、注意事项 ①if条件句were,should,had,省if,并使用倒装语序. ②现代英语if条件状与句谓语词be其形式般用were
不可以。条件状语从句可以改为：祈使句+and/ then+you will/can等开头的简单句。如上句可改为：Play football well,and you can join us.
No.
从句主句主语是一致的 but one is "ask" another one is "tell"
can not take the "if" away. So "Play football well,and you can join us." is not good either, ( Who? I can say "We play football well,and you can join us.)
Anyway this is a typical Sino-English. You should say like this:
If you are good at football, You may join us.
or If you like football, You may join us.
不能。Playing football well，you can join us里的playing是做原因状语或者时间状语，不能做条件状语。等于是because/when you play football well....，意思和if不同。
只能改为Play football well,and you can join us.
不能
if真实的条件句时，主将从现（主未必讲，可以使祈使句，从必须现），并且不能省略，省略的情况就不是条件状语从句，而是伴随状语或原因状语从句等。
if如果引导的是虚拟语气，那么后面的句子中又had做助动词可以省略if并把had提前，如：had i finished the work earlier,i would have been able to play with them.(表示与过去事实相反）如果从句的谓语动词是were或should的话也同样，都表示跟过去事实相反
乔瑗青可： 不可以.条件状语从句可以改为:祈使句+and/ then+you will/can等开头的简单句.如上句可改为: Play football well,and you can join us.
虹口区18214501940： if 可以省略they are吗,就像while(they are)good这样? - ？
乔瑗青可： 可以的,但要在对方明确你所指的东西时.比如You can take them home if they are clean.= You can take them home if clean.
虹口区18214501940： if引导的条件状语从句可不可以省略 - ？
乔瑗青可：[答案] 状语从句可以省略 主语+ be 比如:I will help you if (it is) possible. The medicine will work best if (it is ) taken according to the instructions. 【俊狼猎英】 欢迎追问!
虹口区18214501940： 英语虚拟语气中if什么情况不可省略 - ？
乔瑗青可： 为大家介绍If的虚拟语气中的三种省略形式,当从句中含有were/should/had的形式时,If可以省略,但句子应为倒装形式,即were/should/had要提前置于句首.下面,MasterOsifu English以例句形式为大家讲解.1.过去的情况:If we had found ...
虹口区18214501940： if引导的条件状语从句可不可以省略 - ？
乔瑗青可： 可以的,从句为主语(与主句一致)加be动词(have been也算)时省略,if necessary/possible等看作省略了it is
虹口区18214501940： 省略If的完全倒装 - ？
乔瑗青可： 有固定格式: 对现在的虚拟(假设):If条件句谓语动词用一般过去时(be用were);主句用:would/should/might/could+动词原形. 对将来的虚拟:If条件句谓语动词可用三种情况:一般过去时,should+动词原形,were to+动词原形.主句也用...
虹口区18214501940： 虚拟条件句中if的省略及倒装,had 是指哪个had? - ？
乔瑗青可： 在if从句中,如果含有“were,should,had''时,可省去if而将“were,should,had''置于句首,构成倒装句.例如: Were l in your position,1 would go.如果我处在你的位子上,我就走了. Had you arrived five minutes earlier,you could have seen ...
虹口区18214501940： 虚拟语气中的IF的省略用法:＂当从句中有WERE,HAD,SHOULD,WOULD,等放在主语前可构成疑问句的倒装时,可省略IF,用倒装形式.＂其中从句中有... - ？
乔瑗青可：[答案] 你干吗不问老师呢 免费资源啊. 在虚拟语气条件句中从句谓语动词有were, had, should等词,可将if 省略,把 were, had, should 移到主语之前,采取部分倒装. were to 就不行了呗
虹口区18214501940： 求英语中if从句用法. - ？
乔瑗青可： 1.if引导的条件状语从句中,如果从句的主语与主句的主语一致或者主语是It,而从句的谓语又含有be动词的话,那么主语以及be动词可以省略. 这个句子完整的表达是: a festival that is surely going to leave you with sore neck if it is not a ...
虹口区18214501940： 宾语从句的if有可以省略的情况么? - ？
乔瑗青可： 而if/whether不可省,若省略了,会变成that引导的宾语从句的形式一定不可以省略! 宾语从句中只有that引导的宾语从句在一般情况下that可以省略
