導讀而for表示“原因”時，通常用作連詞，后接從句.例如：We can't go for it is raining.不能走，因為正在下雨。
下面這句話為什么用with不用for:The reason why she had not stopped at the red light was most probably that her eyes had become weak (with)old age.分析：with是介詞；而for表示“原因”時,通常用作連詞,后接從句.例如：We can't go for it is raining.我們不能走,因為正在下雨.
with和for當因為講的區別
而for表示“原因”時，通常用作連詞，后接從句.例如：We can't go for it is raining.不能走，因為正在下雨。
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