一、while, but, however作并列连词的区别
1, "while"着重强调前后两者对比。
如:Tom is reading while Jim playing football.
当吉姆在玩足球的时候，汤姆正在读书。
I am doing homework while you are sleeping.
当你在睡觉的时候，我正在做家庭作业。
2,"But"着重强调前后意思转折，并且转折的语气最为强烈，用的最多。
如：I really want to go shopping with you,but I do have no money.
梦想的声音微博我是真的很想和你一起购物，但是我身上确实没钱啊.
You can jion us in this game,but you must comply with rules of the game.
你可以加入我们，但是你必须遵守游戏规则"。
如：You should finish your work before nine o'clock,however,you can have a break before you start it.
你应该在9点之前完成你的工作，不过在开始之前你可以稍做休息。
I asked uncle LI for more money,however, I have enough money to buy it.
我问李叔叔要了更多的钱，然而我自己有足够的钱买下它。
三者的强调语气由强到弱排列顺序是：but, however, while
二、while, when, as引导时间状语从句时的区别：
①while引导的状语从句中动词必须是持续性。谓语动词多为进行时，或状态动词的一般
时。while 的这些用法可用when代替，等于“at the time that”, “during the time that”。
例如：Please keep quiet while (when) others are studying；
②when除可指一段时间外，还可用来指一点时间，等于“at the time”，也就是说when
引出的时间状语从句中的谓语动词可以是终止性的，也可以延续性的。因此主句和从句的谓语可以是一般时，进行时，或完成时。例如：When I went into the lab, the teacher was doing an experiment.（when不能换成while）He often makes mistakes when he is speaking English.（when可换成while）
③as常可与when，while通用，但强调“一边、一边”。例如：As (when, while) I was walking
down the street, I noticed a police car in front of number 37.
④when引导的状语从句中的主语与主句主语一致，主、谓是“主语+系动词”结构时，这
叶驹腾时主语和系动词可以省略。例如：When (he was) young, he worked for a rich man./ She’ll be here to give you help when (if it is) necessary.
⑤when有时代替if，引导条件句，意为“如果”、“假如”，例如：I’ll come when (if) I’m
free.
二、because since as for 的用法区别
先简要提一下用法区别:
as：由于，鉴于.主从并重，从句说明原因，主语说明结果.
for：因为，由于.表明附加或推断的理由，引导的分句前常有逗号,for分句不放句首.
since：因为，既然.侧重主句，主句表示显然的或已知的理由.
because：因为.表直接原因，回答why的提问；一般放在主句之后，也可单独存在.
because of：后面只能跟名词性的词语.
by：表示通过某种手段，由于某些特定的原因
接下来是详述：（了几个版本，希望能够将这个问题理解得更深一点。）
*详述一： 1、as意为“因为、由于”，语气比because弱，所引导的从句表示的是不言而喻、显而易见的原因和理由，其从句一般放在主句前，如：As it was late ， we came back soon.（由于时间很晚了，我们很快就回来。）
2、because意为“因为”，指直接原因，语气最强，常表示必然的因果关系，引导的原因状语从句是全
句意思的重心，它引导的从句一般放在主句的后面，回答以why引起的特殊疑问句，只能用because，如：Tom didn＇t go to school because he was ill.（汤姆没去上学，他病了。）
3、since意为“由于，既然”，所引导的从句表示的是已知为事实的理由和一种间接或附带的原因，语气比 because弱，但比as强，其从句一般位于主句之前，如：Since I have no money， I can＇t buy any food.（由于我没钱，所以我不能买食物。）
4、for是并列连词，用来附带解释或说明前面一句的情况，有时他它表示的理由是推测性的，它所引导的分句只能放在另一分句后，如：The day breaks，for the birds are singing.（天亮了，因为鸟在叫。）
详述二：
because 是从属连词，接表示直接原因的从句，一般放在主句的后面，也可放在主句前面，它表示的语气最强，在回答why的问句时，必须用because。
例如：The swimming pool won't be open today because they're making repairs.
游泳池今天不开放，因为他们在修理。
Why did you move to France?
你们为什么搬到法国？
Because my father found work in Paris.
因为我父亲在巴黎到了工作。
注意：在英语中用了because后，不可再用so。
as 是从属连词，说明一般的因果关系，语气比because弱，说明比较明显的原因，它引导的从句通常放在句首，有时也可放在句末。
例如：As it is raining, you\'d better take a taxi.
天下雨了，你最好乘出租车。
since 意为"既然"，表示对方已知的无需加以说明的原因或事实，语气比because弱，但是比as 强。
例如：Since we have no money, we can't buy that vase.
既然我们没钱，我们就不能买那花瓶。
Since everybody is here, let's begin our party.
既然大家都到了，那就开始我们的聚会吧！
for 是并列连词，用来附带解释说明前一分句的原因或理由，for引导的并列句，一般放在所要说明的句子的后面。
例如：I went to see him, for I had something to tell him.
我去见他，因为我有事要告诉他。
详述三：
关于 because：语气最强，表示直接原因，可用于回答 why 提出的问题、引导表语从句、用于强调句等，而其余三者均不行：
“Why didn’t he come?” “Because he was ill.” “他为什么没来?”“因为他病了。”
My stomach hurts because I have eaten too many apples. 我肚子痛，因为苹果吃得太多。
That’s because you can’t appreciate music. 这是因为你不能欣赏音乐。
It is because he is honest that I like him. 是因为他诚实我才喜欢他。
关于 since 与 as：
a. 两者所表示的原因都是人们已知的，即对已知事实提供理由，而不是表示直接原因。since 比 as 语气稍强，且比 as 略为正式，它们引导的从句通常放在主句之前，有时也放在主句之后：
As you weren’t there, I left a message. 由于你不在那儿，我留了个口信。
Since you are wrong, you should apologize. 你既然错了，就应该道歉。
b. since 可用于省略句，而其他三者不行：
Since so, I have nothing to say. 既然如此，我无话可说。
关于 for：是并列连词(其余三者为从属连词)，它有时可表示因果关系(通常要放在主句之后，且可与 because 换用)；有时不表示因果关系，而是对前面分句内容的解释或推断(也要放在主句之后，但不能与because 换用)。比较：
The ground is wet, for (=because) it rained last night. 地面是湿的，因为昨晚下过雨。
It must have rained last night, for the ground is wet this morning. 昨晚一定下过雨，你看今天早上地面是湿的。 (此句不能用 because 代 for)
许嵩为什么不进娱乐圈详述四：
1.because
because引导原因状语从句语气最强，表示直接原因，常用来回答由why提出的问题，所引导从句可放在主句前，也可放在主句后。例如：
Well, many people travel because they want to see other countries.
He is absent because he is ill.
Because he didn't catch the last bus, he had to walk home.
Why are you late for school ? Because I missed the first bus.
The swimming pool won't be open today because they're making repairs.
Why did you move to France? Because my father found work in Paris.
[注]because 可以用于否定句中，其它词则不行。例如：
I did it not because I liked to do it but because I had to do it.
2、as
as引导原因状语从句，语气比because弱，说明比较明显的原因，多用于日常语中，常译为“由于”，从句一般放于主句前。例如：
As he wasn't ready in time, we went without him.
As he is ill, he won’t go.
I must stop writing now, as I have rather a lot of work to do.
As you don't feel well,you had better stay at home.
As it is raining, you'd better take a taxi.
3、since
since引导原因状语从句，语气比because弱，但是比as 强。强调说话者和听者双方都知道的原因，常译为“既然”，一般用在这样的句子里。例如：
Since you are not feeling well, you may stay at home.
Since everybody is here, let's begin the meeting.
Since I am a boy, let me carry the case.
Since/As you are busy, you had better not go with us.
Since we have no money, we can't buy that vase.
[注] now that也有此意。如：
Now that you have finished your work, let’s go now.大连市旅游景点
4、for
for是用来附带解释或说明前一分句的原因和理由，有时它表示的理由是推测性的。for引导的从句一般放在主句后，用逗号和主句分开。例如：
I had to stop for a rest, for I was too tired.
Day breaks, for the cock crows.
It must have rained last night, for the ground is wet.
I won't go in, for my father is there.
He diden't wanted to go out,for he was unhappy.
He paid me less than the others, for I'm female.
I went to see him, for I had something to tell him.
[注]比较下列句子：
He is absent, because he is ill.（“生病”是“缺席”的必然原因。)内盘外盘
He is absent, for he is busy. (“忙”不是必然原因，只是一种解释。）
He must be ill, for he is absent. (for表示对原因的一种猜测。)
详述五：
because表示直接理由。强调别人未知的事实，而since，as引导的原因状语从句一般表示已知的事实，强调引起的后果。例如：
He had to to a part-time job after work because he needed money for his marriage. 他下班后还得兼职因为他结婚需要钱。
Since you know you are wrong, you had better admit it. 既然你知道你错了，你最好赶快承认。
As he couldn't express himself freely, he had to make some gestures. 由于他不能表达自如，只得用手势。
尤其在讯问尚未确定的原因时，必须用because.例如:
加入少先队申请书Did he buy many books becasuse he was fond of reading?他买许多书是因为他喜欢看书吗？
because引导的从句可以带修饰语just，only，也可以用于强调据或but并列结构，但since，as不可以。例如:The girl learned to play the piano not because she liked to play the piano but because her parents forced her to. 女孩子弹钢琴不是因为她喜欢弹琴，而是因为她父母强制她学。
It was because he lost it that he found it more valuable than ever. 正因为他失去了它，他才比以往任何时候感到它的宝贵。
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