大学英语AB级重点语法结构复习 (by the time/the end of )+ 表示过去时间的短语或句子。hardly/scarcely +过去完成时+when+过去时;no sooner + 过去完成时 + than + 过去时▲ 现在完成时和现在完成进行时状语词组：this day (week, month, year), so far, for some time, up to now, up to the present, all this year 等。▲ 将来完成时：常和before, u
