时间状语从句主要连词有哪些？
一、时间状语从句
主要连词：when、while、as、as soon as（一......就......）、before、after、since等。时间状语从句要符合“主将从现”的原则：即主句用一般将来时，从句用一般现在时。例如：
I will call you as soon as I arrive in Beijing.
我一到北京就给你打电话。
I will give you a call when I arrive at London.
我到伦敦后会给你打电话。
since 的用法：since引导的时间状语从句必须是一般过去时，其主句必须时现在完成时。例如：
Since I came to Beijing, I have lived here.
自从我来到北京，我一直住在这里。
while 引导的时间状语从句中，谓语动词必须时持续的; when 引导的时间状语从句中，谓语动词可以持续也可以不持续。例如：
While I was away last summer, my dog was taken good care of.
我去年夏天离开的那段日子里，我的狗被照顾的很好。
When I lived in that small village，I often went to play in the field.
当我住在那个小山村的时候，我经常去地里玩耍。
二、条件状语从句
主要连词：if, unless（除非=if...not...）, as long as（只要）等。条件状语从句要符合“主将从现”的原则：即主句用一般将来时，从句用一般现在时。例如：
If it is fine tomorrow，we will have a picnic outdoors.
如果明天天气好，我们会在户外野餐。
三、原因状语从句
主要连词：because, as（由于）, since（因为，既然）等。because 引导的原因是未知的原因，as和since引导的原因是已知的原因。例如：
I didn\\'t go to school because I was ill.
因为我病了，所以没有去上学。
扩展资料
1、副词：
What you said is only partly true．
你的话只部分地对。
2、介词短语：
Thank you for bringing it．
谢谢你帮我带来了。
3、不定式(短语)：
I've come to say goodbye to you．
我是来和你道别的。
4、分词(短语)：
They were busy earning a living．
他们都为生活奔忙。
5、形容词：
Now she was back，eager to see her friends．
现在她回来了，非常期待见到她的朋友们。
6、词组：
She jumped ten feet．她跳了十英尺远。
7、复合结构（独立结构）：
That being the case，we'11 have to reconsider the whole thing．
情况既然如此，我们就得重新考虑整个这件事。
8、从句：
Strong as he was，he couldn't lift it．
尽管他很健壮，却把它提不起来。
您好，（时间状语从句）通常下分3大类，其（从属连词）也不一样：
1）两个动作同时间发生（可以是2个持续动作、1个持续动作+1个瞬间动作）：从属连词通常使用 when, while 和 as；
I was doing my homework when the phone rang.
While some students were singing, others were dancing.
Some students were singing while others were dancing.
As we were playing basketball outside, it suddenly rained.
2）两个动作前后发生：从属连词通常使用 before、after、until、since。比如：
After I had finished my homework, I went out to play.
Before I went out to play, I had finished my homework.
I can't go out to play until I have finished my homework.
Since I have finished my homework, I am going out to play now.
3）两个动作几乎同时间发生：使用（on + 主动词 -ing 形式）。比如：
On arriving in Beijing, we were taken to the hotel by shuttle bus.
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