as作关系代词或关系副词、引导定于从句.
as 在这样的句子里指全句所谈到的内容,引出非限制性定于从句,在从句中一般做主语或宾语.例如：
10、Metals have many good properties,as has been stated before.
11、As we said before,you have done a good job.
(2)like作界词.
12、She,like thousands of others,is fascinated by this work.
三、as与like有时可以换用.
(1)在非正式的美国英语中like可用作连词,代替as.例如：
13、Nobody loves you like I do,baby.
(2)在非正式的文体中,like,常被用来代替as if.
14、Duke said:"You feel like you could reach out and touch it (the space)."
四、as常用于下列词组：在as you know ,as we agreed,as you suggested 这些词组中,as的实际意义不是比较,也不是相似,而是同一事物或人之义.
