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Four short words sum up what has lifted most successful individuals above the crowd: a little bit more.-author-datebecause-since-as-for的用法区别because-since-as-for的用法区别because, since, as, for的用法区别四者均可用来表示原因,区别如下:(1)关于because:语气最强,表示直接原因,可用于回答why提出的问题、引导表语从句、用于强调句等,而其余三者均不行:“Why didnt he come?” “Because he was ill.”“他为什么没来?”“因为他病了。”My stomach hurts because I have eaten too many apples.我肚子痛,因为苹果吃得太多。Thats because you cant appreciate music.这是因为你不能欣赏音乐。It is because he is honest that I like him.是因为他诚实我才喜欢他。(2)关于since与as:a.两者所表示的原因都是人们已知的,即对已知事实提供理由,而不是表示直接原因。since比as语气稍强,且比as略为正式,它们引导的从句通常放在主句之前,有时也放在主句之后:As you werent there, I left a message.由于你不在那儿,我留了个口信。Since you are wrong, you should apologize.你既然错了,就应该道歉。b. since可用于省略句,而其他三者不行:Since so, I have nothing to say.既然如此,我无话可说。(3)关于for:是并列连词(其余三者为从属连词),它有时可表示因果关系(通常要放在主句之后,且可与because换用);有时不表示因果关系,而是对前面分句内容的解释或推断(也要放在主句之后,但不能与because换用)。比较:The ground is wet, for (=because) it rained last night.地面是湿的,因为昨晚下过雨。It must have rained last night, for the ground is wet this morning.昨晚一定下过雨,你看今天早上地面是湿的。(此句不能用because代for)-
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