Past perfect 过去完成时
When we talk about something that happened in the past we sometimes want to refer back to something that happened before that time. We can use the past perfect tense ( had + past participle ) ...
过去完成时
11.15 过去完成时 1) 概念:表示过去的过去----|-------|-----|----其构成是had +过去分词构成。那时以前 那时 现在 2) 用法 a. 在told, said, knew, heard, thought等动词后的宾语从句。 She said (that) she had never been to Paris. b.…...
一般现在时代替将来时
11.22 一般现在时代替将来时 时间状语从句,条件句中,从句用一般现在时代替将来时When, while, before, after, till, once, as soon as, so long as, by the time, if, in case (that), unless, even if, whether, the moment, the minute, the day,…...