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1、状语从句,Adverbial clauses,原因状语从句,because, as, since, now that, 和considering that, seeing that 这六个连词都用于表示表示原因, 但在语气上一个比一个弱.,because：因为.直接而明确的原因，语气最强，通常从句放在主句后.why提问的句子，一般都because回答。,as：因为.语气比because轻，引导从句可放主句前也可放主句后。,since: 既然. 表对方已知的事实或理由，常放在句首。 now that意思与since相似，表示“既然”。,for:因为.但是并列连词，它连接的不是状语句，语气比较强。
2、在句末.,He said that he couldnt work because the computer was out of order.,As he is honest and modest, all his friends like him.,Since everybody has come, we can set off.,Now that you are here, you can join us.,It must be morning,for the birds are singing.,在强调句中强调原因状语从句.只能用because引导，不可用as或 since,It wa
3、s because he was ill that he didnt go with us.,because可以引导表语从句,而as, since不可以，这时主语一般都是it, this, that,Its because he is too lazy.,considering that - 顾及到,Considering that they are just beginners, they are doing quite a good job.,seeing that - 由于,Seeing (that) quite a few people were absent, we decided to put the meeting off.,
