as作为连词时,多数引导（原因、让步、时间等）状语从句；而like作为连词时,只表示‘好像’,如：It was just like you said；当as表示“好像”时,则作为介词,如：He dressed as a policeman；like作为介词,则意为‘（作法、程度等）和···一样’,如：Dick acts like a genteman；而as意为‘也···一样’时,通常使用倒装句式,如：She is a doctor,as was her husband.另外,as常与such/as/the same等词连用,like常接to do/doing sth.
