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As they are expected to be hungry after their long journey,f

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As they are expected to be hungry after their long journey,food is laid out for them.
这是新概念二第96课中的一句话,请问一下这里的as可不可以用for代替,它们之间又有什么区别?
As they are expected to be hungry after their long journey,f
不可以,虽然它们都可以引导原因状语从句.在你举的一二个例子中,都是引导的一个原因状从.
区别就是：for一般是表示对主句的补充说明或解释,放在主句的后面.是个并列连词.
再问： 那么就是说for不可以单独引导一个从句?另外,如果把第二个句子里的for改为as可以吗?
再答： ？for单独引导一个从句是什么意思？既然有从句就一定有主句，而for引导的从句一般是对主句的解释说明，只能放在主句后。基本上for引导从句就这么个用法。 互换的话，在从句表示强烈的原因的时候或者说是逻辑上的因果关系时，是不可以的，as引导原因状从时基本相当于because，而for只是解释，并不一定是原因的意思，从句子的意思就可以推得了。
As they are expected to be hungry after their long journey,f As they are expected to be hungry after their long journey, as they are expected to be hungry after their long journey . Most folks are as happy as they make up their mind to be. 这句 most folks are as happy as they make up their minds to be After a long hard day of work,they are very tried and hungry after a long journey at sea.they found the rich[ ] 5.After a long and tiring journey,they arrived ________. I would be tired after the long plane journey. I think you would____(be)tired after the long Journey to live as long as their own control they will not lose anyt _____ to have a good rest after a long journey.