英语改变句型方法答:2.时间状语:yet,already,just,never,ever,so far,by now,since+时间点,for+时间段,recently, lately, in the past few years, etc. 3.基本结构:主语+have/has +p.p(过去分词)+其它 4.否定形式:主语+have/has + not +p.p(过去分词)+其它 5.一般疑问句:have或has。 6.例句:I've written an ...
求yet的用法,现在完成时,过去完成时详细讲解(have\hade)答:现在完成时说明到目前为止已发生的动作或已存在的状态,通常与yet, by this time, just, ever, never, now,before, several times, since, up to now(直到现在), so far(目前为止), recently, for a long time, already, lately, for+表示时间的词,in the past three years等时间状语连用。