时间状语从句

      连词主要有：when as while before after until as soon as since等

      (1)区别when, as, while的用法

      .when"当......时候"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,如：

      _________ the students heard the teacher's footsteps, they all stopped 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)

      as"当.......时候"或"一边.......一边"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 __________ she was combing her hair.

      她梳头时我们在吃早饭。

      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：

      I can learn ________ I work.

      我可以边工作边学习。

      用when, as, while填空：

      ________ you came in, I was talking with a few boys.

      It started to rain __________ we were playing outdoors.

      They talked _________ they walked down the river.

      __________ it was raining, the students were playing basketball.

      Her brother watched TV__________ he ate supper.

      (2) before引导的时间状语从句，指时间上的"在……之前"

      I'll be back _______________________________________________.

      你离开之前我就会回来。

      (3) as soon as表示"一……就"，做题要注意主将从现

      As soon as we __________ (get) there, he ___________ (tell) us the news.

      我们一到那，他就会告诉我们那个消息。

      (4) since引导的时间状语从句，从句的谓语动词通常为一般过去时，主句的谓语动词通常为现在完成时

      We __________ never __________ (meet) since we ___________ (graduate) from the college.

      大学毕业后我们就再没见过面。

      (5) till/until引导的时间状语从句 till和until同义，作"直到……时(为止)"解，till多用于非正式文体，until多用于句首;not …until通常与after进行转换。如：

      I won't go with you until(till) I finished my homework.

      =____________________________________________________________________.

      等我做完作业我才和你一起去。

      条件状语从句

      连词有：if, unless, as long as

      (1) if引导的条件状语从句 翻译为："如果", 时态遵循主将从现，可以与祈使句进行转换，如：

      If he said that，he can't be telling the truth.

      如果他说了那样的话，他不可能是说实话。

      You ____________ (pass) the exam if you _________ (study) hard.

      = _______________________________________________________________.

      Hurry up, or you'll be late.

      = _____________________________________________________.

      (2) unless"除非"或"如果......不"引导的条件状语从句

      unless引导的是否定条件状语从句，在意义上相当于if...not，而且语气较强，一般不用于虚拟语气。如：

      You'll be late unless you hurry.

      = _____________________________________________________.

      你会迟到的，如果不赶快的话。

      (3) as long as意为"只要;如果"。如：

      __________________________________, we can play.

      只要不下雨我们就能玩。

      地点状语从句

      地点状语从句

      连词主要有：where wherever

      (1) where"在(或到)……的地方"

      Where there is a will, there is a way. 翻译为：有志者事竟成

      Put it where you found it.

      把它放在原来的地方。

      (2) wherever "在(或到)……的各个地方"或"不管哪里"：

      You can go _________________________ these days.

      这些天你可以去你想去的地方。

      你喜欢坐哪儿就坐哪儿。

      ______________________________________________.

方式状语从句

      连词有：as, as if/ as though

      (1) as引导的方式状语从句, 意为"以……方式;如同……那样"，从句有时是省略句。如：

      Do as I say. 要照我说的做。

      I did just as you told me. 我正是照你说的办的。

      Air is to man as water is to fish. 空气之于人犹如水之于鱼。

      (2) as if/as though引导的方式状语从句

      as if和as though的用法相同，都作"好像，仿佛"解。如：

      二者引导的状语从句往往用虚拟语气，表示与事实相反。as if比as though更为常用。但也可用陈述语气，表示所说的情况是事实或实现的可能性较大。如：

      They looked at me as if , as though I were mad.

      他们瞧着我好像我发疯了似的。

      They look as if/as though they know each other.

      他们看来好像互相认识。