because和for的区别

Because和for的用法不同之处一、作为原因状语，because引导的原因状语从句位置灵活，而for引导的原因状语从句只可在主句之后，如:1、The doctor looks tired because he sat up all night.=Because he sat up all night，the doctor looks tired 医生看上去很疲劳，因为他整晚都站着。2、The doctor looks tired , for he sat up all night with the patient.医生看上去很疲劳，因为他整晚都站着。如：二、由because引导的原因状语分句可以单独用来回答why引导的问句，而for引导的分句不行。——Why does the doctor look so tired?为什么医生看上去那么累？——Because he sat up all night.因为他整晚都站着。三、作为原因状语，because前可带否定词或其他修饰语，还可带某些并列连词，而for分句不可。如：The doctor looks tired， not because he isn’t feeling well, but because he sat up all night with the patient.医生看上去很疲劳，不是因为他不舒服，是因为他整晚都站着。四、连词for可以引导一个句子，为上文陈述的情况说明原因或提供理由，而because引导的原因状语从句通常引导从属分句，除用以回答why问句外不单独出现。如：When I saw her in the river, I was frightened. For at that point the currents were dangerous.看到她呆在河里，我很害怕。因为从那里看，喝水很湍急。