I can't go out to play football with you ______ I have a lot of homework to do.括号里答案填的是“because”,我想问为什么不能用“for”呢?

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I can't go out to play football with you ______ I have a lot of homework to do.括号里答案填的是“because”,我想问为什么不能用“for”呢?
I can't go out to play football with you ______ I have a lot of homework to do.括号里答案填的是“because”,我想问为什么不能用“for”呢?

I can't go out to play football with you ______ I have a lot of homework to do.括号里答案填的是“because”,我想问为什么不能用“for”呢?
for表示推断的原因,或对前一分句补充说明理由.
例:It must be morning for the birds are singing.一定是清晨了,因为鸟儿在叫.
because 表示直接的原因.表示按因果关系回答why的问题.

for前面应该加逗号,不用在句中。

for不表示直接原因,表明附加或推断的理由,因此for被看作等立连词,它所引导的分句只能放在句子后部(或单独成为一个句子),并且前后两个分句间的逻辑关系不一定是因果关系,其间用逗号隔开,且for不可置于句首。

因为后面是表明原因,而且“for”后面要用宾格。