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过去完成时课件共32页_图文

The Present Perfect Tense

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.

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.
一段时间的表达方法有两种: for: +一段时间 for a year for two weeks for three years Since 过去的某一时刻, since nine since last week
一般过去时态的时间状语从句
since you came since you got home. 注意:for 和since 所引导的时间状语都表示一段时间.

He has been away since last week. He has been away for one week.

对划线部分提问都用 How long

New
The Past Perfect Tenses

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。

? 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。

? 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!
? 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;

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。

By the time we got there,the bus had already gone.
We got there at 7:00 The bus left at 6:59

When I got to the check-out, I realized I had left my purse at home.

Before I met her,

I had heard a lot about

her.

过去

Before / / By the

When time

+

过去 时态

?

+

完时成态

从句

主句

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__ .

? 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__
his homework at home.

? 她说在我来之前她们已经 做好了一切准备。
She said they _h_a_d_ m__a_d_e all the preparation b_e_f_o_re_ I came.

? 当我到达学校时,学生 们 都已经放学了。
School _h_a_d_ been o_v_e_r by the time I _g_o_t _ there.

? 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.

? 在我进城以前,我们的汽 车已经坏了,再也走不动 了。
Before we went downtown, our car h_a_d__br_o_k_e_n down and couldn’t move _a_n_y_m_o_r_e_ .

? 当警察开始要抓他时,他 已经携带家属去了加拿大.
He _h_a_d _g_o_n_e to Canada with his family when the police _b_e_g_a_n_ to catch him.

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.

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

这个法国人想起来他学过 “cough” 这个词。
The Frenchman remembered that he had learned the word “cough”.

他记得他把钥匙放在房间 里了
He thought he had put his key in the room.

当他到家时,他妈妈已经 睡觉了。
When he got home, his mother had already got to sleep.

过去完成时的用法归纳: 1 可以用by, before 等构成的短
语来表示。
By the end of the match, they had kicked two goals .
2 也可以用when, before, after 等引导的从句来表示。

谢谢!
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