例如：I'm leaving for Beijing.
三．“be to+动词原形”表示按计划要发生的事或征求对方意见。例如：
①Are we to go on with this work?我们继续干吗？
②The boy is to go to school tomorrow.这个男孩明天要去上学。
四．“be about to+动词原形”表示即将发生的动作，意为：很快，马上。后面一般不跟时间状语。例如：
We are about to leave.我们马上就走。
五．某些词，如come， go， leave， arrive， start， get， stay ，live,fly等的一般现在时也可表示将来。
①The meeting starts at five o'clock.会议五点开始。
②He gets off at the next stop.他下一站下车。
六。“be due to"构成的谓语，意味“定于…”也可表示将来时。

主将从现:
主将从现是指在时间状语从句和条件状语从句和让步状语从句中，如果主句是一般将来时，从句用一般现在时替代一般将来时。
主将从现常见的有以下四种情况：
一、时间状语从句的主句是一般将来时，那么从句常常用一般现在时。
如： When I grow up, I’ll be a nurse and look after patients.我长大后要当一名护士，照顾病人。

二、如果主句是祈使句，那么从句通常要用一般现在时
如：Don’t laugh at me when I make a mistake.我犯错误的时候不要笑话我。

三、如果主句是含有情态动词的一般现在时，根据需要从句多用一般现在时
如：You should be quiet when you are in the reading room.在阅览室时应保持安静。

四、 如果if的条件状语从句遇到变换间接和直接时 , 祈使句应用not　to....
如:She said not to close the window
常见的时间状语从句的连词有：as soon as,when,while ,as,until等
主将从现说的是在含有时间状语从句和条件状语从句的主从复合句中，如果主句的时态是一般将来时，那么从句要用一般现在时。例如：
I will tell him about it when he comes.
If it is fine tomorrow, we will go outing.
如果主句的时态是过去将来时，那么从句要用一般过去时。例如：
He said that he would have another try if he had the chance.
I knew he could help me if he was free the next day.
主要标志有：if 、unless 、until、 when 、as soon as

考点名称：状语从句

• 状语从句：
  指句子用作状语时，起副词作用的句子。它可以修饰谓语、非谓语动词、定语、状语或整个句子。
  根据其作用可分为时间、地点、原因、条件、目的、结果、让步、方式和比较等从句。
  状语从句一般由连词(从属连词)引导，也可以由词组引起。
  从句位于句首或句中时通常用逗号与主句隔开，位于句尾时可以不用逗号隔开。

• 状语从句分类:
  1、时间状语从句
  常用引导词：
  when, as, while, as soon as, while, before, after, since , till, until
  特殊引导词：
  the minute, the moment, the second, every time, the day,the instant, immediately , directly, no sooner … than, hardly …when, scarcely … when
  I didn't realize how special my mother was until I became an adult.
  While John was watching TV, his wife was cooking.
  The children ran away from the orchard(果园) the moment they saw the guard.
  No sooner had I arrived home than it began to rain.
  Every time I listen to your advice, I get into trouble.
  
  2、地点状语从句
  常用引导词：
  where
  特殊引导词：
  wherever, anywhere, everywhere
  Generally, air will be heavily polluted where there are factories.
  Wherever you go, you should work hard.
  
  3、原因状语从句
  常用引导词：
  because, since, as, for
  特殊引导词：
  seeing that, now that, in that, considering that, given that, considering that, as much as, so much as
  My friends dislike me because I'm handsome and successful.
  Now that everybody has come, let's begin our conference.
  The higher income tax is harmful in that it may discourage people from trying to earn more.
  Considering that he is no more than 12 years old, his height of 1.80 m is quite remarkable.
  
  4、目的状语从句
  常用引导词：
  so that, in order that
  特殊引导词：
  lest, in case, for fear that,in the hope that, for the purpose that, to the end that
  The boss asked the secretary to hurry up with the letters so that he could sign them.
  The teacher raised his voice on purpose that the students in the back could hear more clearly.
  
  5、结果状语从句
  常用引导词：
  so that, so… that, such … that,
  特殊引导词：
  such that, to the degree that, to the extent that, to such a degree that,
  He got up so early that he caught the first bus.
  It's such a good chance that we must not miss it.
  To such an degree was he excited that he couldn't sleep last night.
  
  6、条件状语从句
  常用引导词：
  if, unless,
  特殊引导词：
  as/so long as, only if, providing/provided that, suppose that, in case that, on condition that
  We'll start our project if the president agrees.
  You will certainly succeed so long as you keep on trying.
  Provided that there is no opposition, we shall hold the meeting here.
  
  7、让步状语从句
  常用引导词：
  though, although, even if, even though
  特殊引导词：
  as(用在让步状语从句中必须要倒装),while ( 一般用在句首 ),no matter …, in spite of the fact that, while, whatever, whoever, wherever, whenever, however, whichever
  Much as I respect him, I can't agree to his proposal.
  尽管我很尊敬他, 我却不同意他的建议。
  The old man always enjoys swimming even though the weather is rough.
  No matter how hard he tried, she could not change her mind.
  He won't listen whatever you may say.
  
  8、比较状语从句
  常用引导词：
  as(同级比较), than(不同程度的比较)
  特殊引导词：
  the more … the more … ; just as …, so…; A is to B what /as X is to Y; no … more than; not A so much as B
  She is as bad-tempered as her mother.
  The house is three times as big as ours.
  The more you exercise, the healthier you will be.
  Food is to men what oil is to machine. 食物之于人,犹如油之于机器。
  
  9、方式状语从句
  常用引导词：
  as, as if, how
  特殊引导词：
  the way
  When in Rome, do as the Roman do.
  She behaved as if she were the boss.
  Sometimes we teach our children the way our parents have taught us.

• 状语从句用法:
  时间状语从句
  (1) when引导的时间状语从句
  ①.when引导的时间状语从句，其动词既可以是延续性动作的动词，也可以是瞬间性动作的动词，而且可以表示主句的动作和从句的动作同时发生，或者从句的动作发生在主句的动作之前。如：
  when you apply for a job, you must present your credentials.
  当你申请工作时，你必须递交你的有关证件。（同时）
  when the students heard the teacher’s footsteps, they all atopped talking.
  当学生们听到老师的脚步声时，他们都停止了讲话。（从句动作发生在前）
  ② when还可表示just then（正在那时，突然）的意思，此时其所引导的从句只放在主句之后。如：
  we were about to start when it began to rain.
  我们正要动身，突然天下起雨来。
  The game had hardly/scarcely/barely begun when it started raining.
  比赛刚刚开始就下起雨来。
  (2) as引导的时间状语从句
  as引导的时间状语从句其动词的动作是延续性的，而且侧重表示主句和从句的动作并相发生：
  We were having breakfast as she was combing her hair.
  她梳头时我们在吃早饭。
  It will warm up a little bit on Sunday as the cold front passes.
  寒流一过，星期日就会有点暖意了。
  (3) while引导的时间状语从句
  while表示“在某一段时间里”或“在……期间”，其所引导的从句的动作是延续性的，并侧重表示和主句的动作同时发生。如：
  When the teacher paraphrased the text in English, the students listened attentively and took notes.
  当老师用英语解释课文时，学生们聚精会神地听并做着笔记。
  I can learn while I work.
  我可以边工作边学习。
  (4) before引导的时间状语从句
  ① before“在……之前”
  I have finished my dissertation before my supervisor went abroad.
  在我的导师出国之前，我已完成了我的学位论文。
  I’ll be back before you have left.
  你离开之前我就会回来。
  ② before“……之后才”
  It may be many years before we meet again.
  可能要过许多年我们才能再见了。
  It was three days before I came back.
  他三天后才回来。
  (5) as soon as/once/directly/the instant等引导的时间状语从句