主将从现如何用（让步状语从句用主将从现吗）？如果你对这个不了解，来看看！
日积月累-跟我学英语. 主将从现，下面是学习不就是日积月累给大家的分享，一起来看看。
主将从现如何用
We will stay at home if my aunt______to visit us tomorrow.
在if 引导的条件句中，主句用将来时态，从句用一般现在时，即“主将从现”。
主句：We will stay at home...将来时
if引导my aunt(三单）comes to visit us.
让步状语从句用主将从现吗
昨天石安老师带着大家一起学习了介词的用法，有不少同学私信给我，希望石安老师也讲解一下连词的用法。今天，我们一起来总结一下连词的相关用法。因为词性都是通用的，所以无论你是初中的还是高中的同学，大家都有必要认真整理一下，最好打印出来。争取寒假归来变学霸！
连词的核心考点
1、连词的含义：连接词与词、短语与短语、或引导从句的词叫连接词。
2、连词的分类：连词分为并列连接词和从属连接词两种。
1、并列连接词连接并列的词、短语、从句或句子。常见的并列连接词有：and(和),but(但是),or(或者,否则),nor(也不), so(所以), however(然而,无论如何),for(因为),still(可是),as well as(也),both..and...(...和...), not only ...but also...(不但…而且…), either… or…(或…或…),neither… nor…(既不…也不…)等。
2、从属连接词用于引导从句,常见的从属连接词有：
when(当…时候), while(正当…时候), after(在…之后), before(在…之前), since(自从), until(直到), although/though(虽然), if(假如), as(如…一样；由于), as …as…(和…一样), as far as(就…而言), as long as(只要), as soon as(一…就…), even if(即使), because(因为), unless (除非), than(比…), whether (是否…), in order that…(为了), so…that…(如此…以致), so that…(以便), now that…(现在既然), by the time…(到…时候), every time…(每当), as if…(仿佛),no matter when(或whenever)(无论何时),no matter where(或wherever)(无论在哪里)等。
［辨析归纳］
(1) because、as、since、for的用法：because(因为)表示原因的语气最强,常表示必然的因果关系,从句一般放在主句后面；另外,回答why的问句只能用because. as(因为)表示一般的因果关系,语气比because弱,说明比较明显的原因,它引导的从句可以放在句首也可以放在句尾。since(既然)表示对方已经知道、无需加以说明的原因或事实。for(因为)是并列连词,语气较弱,用来补充说明理由或提供一种解释。
如：He is not at school today because he is seriously ill.（他今天没有上学因为他病得厉害）/ As all of you have got here, now, let’s go to the zoo.（既然大伙儿都到了我们就去动物园吧）/ I will ask Lin Tao to go with me since you are very busy.（既然你很忙我就叫林涛和我一起去吧）/ We must be off now for the match starts at 7：00.（我们得走了因为比赛在七点开始）
(2)if、whether的区别：表示“是否”时,if和whether同义,引导宾语从句,另外,whether还可以引导主语从句、表语从句(以及同位语从句)等名词性从句或者让步状语从句；而if还可以表示“如果”,引导条件状语从句,(主句与从句遵循主将从现的原则)。如：I don’t know if/whether he will arrive on time.（我不知道他是不是会按时到达）/ I will ring you up if he arrives on time.（如果他按时到达我会给你打电话的）
[注意]以下情况只能用whether不能用if：
①引导主语从句,②引导表语从句,③引导从句作介词宾语,④引导不定式短语,⑤引导让步状语从句,⑥在动词discuss之后,⑦在wonder / not sure之后,⑧在if与whether含义易混时。在某种程度上，可以说whether是万能词。
如：Whether it is a fine day next Sunday is still a question.（下个星期天是不是个好天还是个问题）(引导主语从句) / Please ask him whether to go there with a raincoat or not.（请问一下带不带雨衣去那儿）(作动词的宾语) / Hainan is the place to be, whether it’s summer or winter.（海南是个该去的地方无论冬夏）(引导让步状语从句)/ Please let me know whether you need my help.（请告诉我你是否需要我的帮助）(引导宾语从句)(如果换成if则还可能表示“如果你需要我的帮助请告知”)
(3)while、when、as的用法区别：while常表示一个较长的动作,它引导的从句动作与主句的动作是同时发生的、是平行的；when可以表示较短的动作也可以表示较长的动作,主句和从句的动作可以同时发生也可以先后发生；as与上两词同义,可替换while和when, 表示主句和从句的动作同时发生,常译为“一边……一边……”。
例如：Please do not trouble me while I am writing my homework.（我写作业时请不要打扰我）/ I’ll go home when I have finished my job.（我干完了活儿就回去）/ They were running quickly across the road when they heard the sound of a truck coming.（他们正快速地穿过马路忽然听到了卡车开来的声音）/ As we walked in the dark street, we sang songs and talked loudly.（当我们在黑洞洞的街上走路时我们高声地唱歌说话）
(4)till/until与not…till/until的区别：前者表示一个延续性的动作,后者表示一个才开始的动作。如：I will stay here and watch the baby until you return.（我会呆在这里看着娃娃直到你回来）(stay这个动作一直进行到你return) / They won’t go on working until they get what they think is reasonable.（他们要到获得了他们认为合理的东西时才会继续干下去的）
另外till与until基本可以互换,但是在句首时只能用until,不能用till. 如：Until the last minute of the match we kept playing.（我们坚持到比赛的最后一分钟）/ Not until he had finished his work did he go home.（直到做完工作他才回家）（倒装句）
(5)though与although的区别：两个词都表示“虽然”,均不可以与but同时使用,但在句中可加still或yet连用。although“尽管、虽然”仅作连词,比较正式,一般可以换为though； though“虽然、尽管、即使”,还可以与even连用(=even if),表示“即使、纵然”,作副词时意思是“然而、不过”,不能放在句首。
例如：He passed the exams although illness prevented him from going to classes.（尽管疾病使他无法上课但是他还是通过了考试）/ she won’t leave the TV set,even though her husband is waiting for her for the supper.（她不愿离开电视机虽然丈夫在等她吃饭）/ It was a quiet party. I had a good time, though.（这是个不热闹的聚会尽管如此我还是玩得很开心）
(6)prefer to…rather than…与prefer…to…的区别：prefer to…rather than…后面都是用动词原形,prefer…to…都是用动名词或名词。
如：I prefer English to Japanese.（与日语相比我更喜欢英语）/ I prefer to learn English rather than learn Japanese. （与日语相比我更喜欢学英语）
趁热打铁
1. I’d like to go shopping with you, _______ I’m too busy today.
A. but B. and C. so D. or
2. _____ Lily _________ Lucy may go with you because one of them must stay at home.
A. Not only...but also B. Neither...nor C. Both...and D. Either …or
3. Be careful, _______ you will make mistakes in vour exams. --I know that, Mum. One can never be too careful.
A. and B. or C. nor D. but
4. --You watched the fashion show last night, didn’t you? --Yes, _______ I missed the beginning.
A. so B. and C. but D. then
5. Work hard, _____ you may catch up with your classmates soon.
A. or B. but C. and D. yet
阅读理解专练
For many years Henry had been a journalist. He had worked on many international newspapers and magazines and traveled all over the world. Henry had witnessed wars and natural disasters such as floods, earthquakes and erupting volcanoes .
He had reported on serious accidents such as major fires and airline crashes. He had seen every kind of terrible crime and strange event there was. He had met and written about some of the most unusual people in the world. In fact, there wasn’t much that Henry had not seen or done.
Now he was retired from journalism(新闻业). He owned a very expensive restaurant and spent his days talking to his wealthy and important customers. He liked to say that nothing surprised him.
One day he was sitting at the bar in his restaurant when a big gorilla walked in and asked for a table. Henry showed no surprise. He took the gorilla to a table and handed him a menu. He treated him politely and pretended there was nothing at all strange about having a gorilla in his restaurant.
The gorilla looked through the menu and ordered a salad. Henry served the gorilla his salad personally, knowing that his waiters and waitresses would be too frightened.
At last the gorilla finished his salad and asked for the bill. Henry wrote out the bill and handed it to the big animal. The gorilla studied it, shook his head sadly, then gave Henry fifty dollars.
“Thank you”, Henry said, and then to make conversation he added, “We don’t get many gorillas in this restaurant.”
“At fifty dollars for a salad,” the gorilla said, “I’m not surprised.”
1．What does the underlined word “witness” mean?
A. to see or notice something by being present when it happens
B. to be a sign of
C. to tell and prove what happened in court
D. to feel unhappy with
2．One day when a gorilla came into the restaurant, Henry was .
A. very surprised by the gorilla B. not disturbed by the gorilla
C. very interested in the gorilla D. scared of the gorilla
3．From the sentence “Henry served the gorilla his salad personally, knowing that his waiters and waitresses would be too frightened” you learn that:.
A. His staff were not brave people B. Henry didn’t normally serve customers
C. The gorilla had eaten there before D. The gorilla was careful with his money
4．What the gorilla said at last really meant that he was .
A. angry with the salad B. still hungry after his salad
C. not surprised by the cost of the food D. surprised by the prices
石安老师特别提醒：若有任何疑问，请私信留言，我会适时答疑解惑，你的进步是我最大的快乐！