.出现以下的词汇，通常使用“现在完成时”结构。1)ever since, since, since then3个2)by now, so far, till/until now, up to now5个3)before, lately, recently3个4)in recent years；in the past2个5)in/for/over/during the last/past +时间段2个6)This/That/It is + 最高级结构 (that) +从句用现完1个7)This/That/It is the first/second time (that) +从句用现完1个8)This/That/It is the only(that) +从句用现完1个9)不很常见的up to the present, to date, thus far3个10)不很常见的long ago, from2个以上的划分是为了讲解记忆的方便而已。1.ever since, since,
