实用四种状语从句 四级从句句型实用
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四种状语从句 四级从句句型篇1
珍惜时间的人必将为时间所珍惜，抛弃时间的人必将被时间所抛弃。以下是网友为大家搜索分享的“实用四种状语从句 四级从句句型实用”，希望能给分享的“实用四种状语从句 四级从句句型实用”，用来说明人所不知的原因，回答why提出的问题。当原因是显而易见的或已为人们所知，就用as或 since。
i didn't go, because i was afraid.
since /as the weather is so bad, we have to delay our journey.
2)由because引导的从句如果放在句末，且前面有逗 号，则可以用for来代替。但如果不是说明直接原因，而是多种情况加以推断，就只能用for。
he is absent today, because / for he is ill.
he must be ill, for he is absent today.
表示目的状语的从句可以由that, so that, in order that, lest, for fear that, in case等词引导，例如：
you must speak louder so that /in order that you can be heard by all.
he wrote the name down for fear that(lest) he should forget it.
better take more clothes in case the weather is cold.
结果状语从句常由so… that 或 such…that引导，掌握这两个句型，首先要了解so 和 such与其后的词的搭配规律。
比较：so和 such
其规律由so与such的不同词性决定。such 是形容词，修饰名词或名词词组，so 是副词，只能修饰形容词或副词。 so 还可与表示数量的形容词many, few, much, little连用，形成固定搭配。
so foolish such a fool
so nice a flower such a nice flower
so many / few flowers such nice flowers
so much / little money such rapid progress
so many people such a lot of people
( so many 已成固定搭配，a lot of 虽相当于 many，但 a lot of 为名词性的.，只能用such搭配。)
so…that与such…that之间的转换既为 so与such之间的转换。
the boy is so young that he can't go to school.
he is such a young boy that he can't go to school
连接词主要有 if, unless, as/so long as, on condition that 等。.
if 引导的条件句有真实条件句和非真实条件句两种。非真实条件句已在虚拟语气中阐述。
unless = if not.
let's go out for a walk unless you are too tired.
if you are not too tied, let's go out for a walk.
典型例题
you will be late ___ you leave immediately.
a. unless b. until c. if
d. or
答案a。 句意：除非你立即走，否则你就回迟到的。可转化为 if you dong leave immediately, you will be 、d句意不对，or表转折，句子如为 you leave immediately or you will be late.
though, although
注意： 当有though, although时，后面的从句不能有but，但是 though 和yet可连用
although it's raining, they are still working in the field.
虽然在下雨，但他们仍在地里干活。
he is very old, but he still works very hard.
虽然他很老，但仍然努力地工作。
though the sore be healed, yet a scar may remain.
伤口虽愈合，但伤疤留下了。 (谚语)
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