福建专升本英语语法：状语从句

　　福建专升本考试，大学英语是每个类别必考的。而英语这门科目，词语用法与语法结构是重要的考核内容。库课小编接下来将语法相关知识点进行整理，方便同学们学习。今天分享的是状语从句。

　　状语从句

　　用来修饰主句中的动词，副词和形容词的从句叫状语从句。

　　根据其含义状语从句可分为时间状语从句，地点状语从句，条件状语从句， 原因状语从句，结果状语从句，比较状语从句，目的状语从句，让步状语从句。

　　>>> 状语从句常用连词：

　　>>> 状语从句的分类

　　1. 时间状语从句

　　(1)时间状语从句常用when, as, while, before, after, since, till, until, as soon as等连词来引导。

　　例：It was raining hard when got to school yesterday.

　　(2)在时间状语从句里，通常不用将来时态，用现在时态表示将来的动作或状态。

　　例：I'll ring you up as soon as I get to New York.

　　3)在带有till或until引导的时间状语从句的主从复合句里，如果主句用肯定式，其含义是“一直到……时”，谓语动词只能用延续性动词。如果主句用否定式，其含义是“直到……才……”, “在……以前不……”, 谓语动词可用瞬间动词。

　　例：The young man read till the light went out.

　　2. 条件状语从句

　　(1)条件状语从句通常由if, unless引导。

　　例：What shall we do if it snows tomorrow?

　　(2)在条件状语从句里，谓语动词通常用现在时态表示将来的动作或状态。

　　例：I'll help you with your English if I am free tomorrow.

　　(3)“祈使句 + and (or)+ 陈述句” 在意思上相当于一个带有条件状语从句的复合句。

　　例：Hurry up, or you'll be late.

　　=If you don't hurry up, you'll be late.

　　3. 原因状语从句

　　(1)原因状语从句通常由because, since, as引导。

　　例：He didn't come to school because he was ill.

　　2)because表示直接原因，语气最强。Because引导的原因状语从句多放在主句之后。回答由why提出的问题，只能用because。

　　As和since语气较弱，一般用来表示明显的原因。由as和since引导的原因状语从居多放在句首。

　　例：------Why aren't going there?

　　------Because I don't want to.

　　As he has no car, he can't get there easily.

　　Since we have no money, we can't buy it.

　　(3)because和so不能同用在一个句子里。

　　4. 结果状语从句

　　(1)结果状语从句由so…that, such…that, so that引导。例：He is so poor that he can't buy a bike for his son.

　　(2)so…that语such...that可以互换。例如：

　　在由so...that引导的结果状语从句中，so是副词，与形容词连用。其结构是: “...so + 形容词(副词)+ that + 从句”。

　　例：He was so glad that he couldn't say a word.

　　(3)如果名词前由many, much, little, few等词修饰时，只能用so, 不用such。

　　例：Soon there were so many deer that they ate up all the wild roses.

　　5. 比较状语从句

　　比较状语从句通常由as… as, 比较级 + than…等连词引导。

　　例：Tom runs faster than John does.

　　6. 目的状语从句

　　目的状语从句通常由 so that, in order that引导。

　　例：We started early so that we could catch the first train.

　　7. 让步状语从句

　　(1)让步状语从句通常由although, though等连词引导。

　　例：Though he is young, he knows a lot.

　　(2)although(though)不能用在同一个句子中。

　　例：我们不能说：Though it was raining hard, but he still went out.

　　应该说：Though it was raining hard, he still went out.或It was raining hard, but he still went out.

　　8. 地点状语从句

　　地点状语从句常常由where来引导。

　　例：Go where you like.

　　以上就是库课小编的分享，更多资讯可到库课网校资讯了解。