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表原因的时候 because for since 有什么区别

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表原因的时候 because for since 有什么区别
Mother does not allow him to play computer games ,but she is afraid that it will be bad for his syudies.答案是把but 改成because .请问可以改为for 或since 如果不行,为什么?
也即是问都引导从句,表原因的时候 because for since 有什么区别?
看下面解释你就明白了
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:
"Why did you do it?" "Because Carlos told me to".
We can't go to Julia's party because we're going away that weekend.
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.
since
since “因为,既然” 侧重主句,主句表示显然的或已知的理由.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 we've got a few minutes to wait for the train,let's have a cup of coffee.
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.
for
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.是用来附带解释或说明前一分句的原因和理由.例如:
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 must be ill,for he is absent.
I went to see him,for I had something to tell him.