为什么这里要用since和as,而不用because?我有两个疑问想请教大家：1、I didn"t know English,I had to ask someone to be my interpreter.2 、you walk ahead you know the way better .这两题是张道真语法上的题目

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为什么这里要用since和as,而不用because?我有两个疑问想请教大家：1、______I didn"t know English,I had to ask someone to be my interpreter.2 、you walk ahead ______ you know the way better .这两题是张道真语法上的题目
为什么这里要用since和as,而不用because?
我有两个疑问想请教大家：1、______I didn"t know English,I had to ask someone to be my interpreter.2 、you walk ahead ______ you know the way better .这两题是张道真语法上的题目,第一题的答案是since和as都可用,第二题是since.我搞不懂为什么这两题不用because呢?
请大家有懂的能抽出一点时间来针对这两题帮我解答一下,

为什么这里要用since和as,而不用because?我有两个疑问想请教大家：1、______I didn"t know English,I had to ask someone to be my interpreter.2 、you walk ahead ______ you know the way better .这两题是张道真语法上的题目
Since一般用在完成时态里面
当然它也有其他的意思,表示“既然怎么怎么样”
第一题,个人认为Because不错!当然since和as也可以
第二个：明显是在对话,意思是“既然你知道这条路更多一些,那么请你带路吧”
如果有because的话显得不太礼貌：“因为你知道路,所以你必须带路”

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第一题不用because 是因为because不会单独出现在句首.
如果想用because的话,那么就要加so来连接后面的句子如下:
example:
because i didn't know english, so i have to ask someone to be my interpreter.
你也可以用therefore, hence,that's why 来代替so
第二题如一楼说的样
明显是在对话，意思是“既然你知道这条路更多一些，那么请你带路吧”
如果有because的话显得不太礼貌：“因为你知道路，所以你必须带路

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第二句当然是用since比较好
因为要表达的意思是。。既然，不是因为
但，语法上，这两个写 because 并没有错的
是谁说because是错的？

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