过去完成时优秀课件

（2） by the time （= when） 到……时
我们赶到学校时，已经 上课了。
_B_y__th__e_t_im__e__ we got to school, the class _h_a_d_ already _b_e_g__u_n_. _
当我到达火车站时，火车 已经开走了。
By the time I g__o_t to the station, the train _h_a_d_ already _l_e_ft__ .
(3)Since + 过去的某一时刻, since nine yesterday since last week since you came since you got home.
We haven’t seen each other since last year.
We haven’t seen each other since we graduated from our university.
到上学期末，我们共学 1500 个单词。
By the e_n_d_ of l_a_s_t term we _h_a_d_l_e_a_rn_t_1,500 words
当他到学校时，他意识 到 他把作业忘在家里了。
When he _g_o_t to school, he _r_e_a_li_z_e_d that he _h__a_d_l_e_ft__
我已经做完作业了。 I have finished my homework.
表示在说话时已经做完。
在六点以前，我就已经完 成作业了。
By six o’clock, I had finished my homework.
表示在过去的某一段时间 （six o’clock 以前）已经做 完作业，与现在无关。
2.某个动作从过去已经开始,一直持续到现在,还 有可能持续到将来.动作的持续性要通过一段时 间来表示. (1) recently, in recent years
(2) For/in/during/over the last/past 30 years, great changes have taken place in my hometown.
他说他从来没读过如此有趣的 故事。
He said that he had never read such an interesting story
1.（2011·天津卷）In the last few years thousands of
films all over the word．
B
A．have produced
用于由by, before 等构成的短 语引导的从句或者通过上下文 表示。
具体用法如下：
Before / When / By the time/By By the end of
+
过去 时态
٫
+
过完时去成态
从句
主句
Before I met her,
I had heard a lot about her.
Fra Baidu bibliotek
B．have been produced
C．are producing
D．are being produced
2.（2011·北京卷）Experiments of this kind in
both the U．S．and Europe well before the Second
D World War．
他说他从未看过如此令人 兴奋的比赛。
He said that he had never seen such an exciting match before!
Summary
过去完成时与现在完成时二者 用法基本相同，但现在完成时 以现在时间为基点，过去完成 时则以过去的时间为基点，与 现在无关，即过去的过去。过 去完成时常用于宾语从句中;
他们已经吃过早饭了。
They have already had
breakfast. 在他们到旅馆之前他们已
经吃过早饭了。 They had already had breakfast before they arrived at the hotel.
我从未看过如此令人兴奋 的比赛
I have never seen such an exciting match before!
New
The Past Perfect Tenses
过去完成时
构成？
现在完成时：
助动词have / has + 过去分词
过去完成时：
助动词had + 过去分词
I have known him for three years. 我认识他三年了。
I had known him when I was a student. 我当学生时，就已经认识 他了。
当我迟到20分钟到机场时， 他已经乘出租车去宾 馆了。
He _h_a_d_ta_k_e_n__ a taxi to the hotel when I _g_o_t_t_o _ the airport 20 minutes later.
当我昨天到达电影院时，电 影已经开始了。
When I got to the cinema yesterday, the film had already begun.
his homework at home.
她说在我来之前她们已经 做好了一切准备。
She said theyh_a_d__m__a_d_e all the preparationb_e_f_o_r_eI came.
当我到达学校时，学生 们 都已经放学了。
School _h_a_d_b_e_e_n over by the time I _g_o_t_ there.
过去完成时优秀课件
have/has+过去分词
1.现在完成时态表示过去发生的动作对现在造成的影响或 结果
Our teacher has left. We have studied English. I have already finished the homework. He has had his lunch. He has become a doctor.