如何区分as和since还有for作为因为来讲时他们的用法.

副词 adv.1.同样地, 一样地 She is as tall as her mother.她和她母亲一样高.The dining room was twice as big as the Tom's.这个餐厅比汤姆的餐厅大一倍.This is as difficult a problem as you are likely to mee...