用法：
1. 过去完成时动词表示过去某一时间或某 一动作之前完成的动作或状态。强调过去 某一动作发生在另一动作之前时。
1.他说他以前见过你。 He said that he _h_a_d__s_e_e_n______ (see) you before. 2. 到六点钟为止他们已经工作八小时了。 By six o’clock they __h_a_d__w_o_r_k_e_d___(work) for eight hours.
过去完成时与 by then(截止到那时); by 9 o’clock(直到
九点钟) by the end of …(在…结束/末之前); by the time…
(在…时之前); up till then (直到那时); up until last night(直到昨晚）等连用，表示过去的过去。
She said that she _h_a_d_n_’_t_b_e_e_n__to___(not go to) the Great Wall yet.
汇报结束
谢谢大家! 请各位批评指正
1. 到昨晚上，他已写完那封信。
By yesterday evening he _h_a_d_w__r_it_te_n__ (write) that letter. 2. 他说他以前见过你。 He said that he __h_a_d__s_e_e_n___(see) you before. 3. 当我进来时，他已做完了作业。 When I came in he __h_a_d_f_in__is_h_e_d_____(finish) his homework.
By the time I got outside, the bus had already left.
我出去的时候,公共汽车已经开走了.
by the time 意思是 “到…的时候”, 相当于 when , 后接过去时的句子 时, 主语的谓语动词用过去完成时态.
构成：助动词had + 动词的过去分词
用法：
3. 过去完成时和 already, just, ever, yet 等连用表示过去的过去。
例如：1. 他告诉我说他们队已经赢了。
He told me that his team __h_a_d_____ already ____w__o_n____ (win). 2. 她说她仍没去过长城。
初中英语语法过Biblioteka 完成时The Past Perfect Tense 过去完成时
3. 常用的几种方式: 用介词by, before 等构成的时间短语.
We had learnt 20 English songs by the end of last month.
用连词when, before, after或者短语by the time 引导的时间状语从句. The plane had taken off when I reached the airport. By the time I got up , my brother had left home.
My little brother went to bed
8:00pm
9:00pm
now
I got home
By the time I got home, my little brother had gone to bed
By the time I got outside, the bus had already left.