2022届高考英语二轮专题复习：It be＋时间段＋since句型课件（17张ppt）

(共17张PPT)
“It be＋时间段＋since ...”句型
一、注意四个句型：
1、 It be＋时间段＋since从句
2、 It be ＋时间段＋before从句
3、 It be ＋时间点＋when从句
4、It be＋介词＋时间点/段＋
that从句”为强调句型。
二、句型讲解：
1、 It be＋时间段＋since从句。意为“自从……以来已有多长时间了”。
（1）、时态的运用：
①主句中若be为is/has been，since从句用一般过去时；
②若be为was，则从句用过去完成时。
It has been six years since we last saw each other, you know.
It has been 20 years since he graduated from the school.
It was years since the war had broken out.
(2)、含义理解：
It is five years since I studied English.
①当since从句中的动词为“延续性动词”时，
表示否定含义（动作从结束时算起）。
翻译成 “没有干---多久了”。
It is five years since I began to study
English.
②当since从句中的动词为“非延续性动词”
时，表示肯定含义（动作从开始时算起）。
翻译成 “干---多久了”。
It is five years since I studied English.
例如：
It is 11 years Hongkong returned to China.
It has been five years since she home.
It four years since he had died.
It two years since he studied English.
It is two days she was ill.
since
left
was
is
since
2、“It be ＋一段时间＋before从句
（1）、时态的运用：
①主句中若be为一般将来时, 从句用一般现
在时;
It will be many years before we meet
again.
②若be为一般过去时，则从句用一般过去时。
It was a long time before I got to
sleep again.
(2)、句型含义：
① It was ＋时间段＋before ...过了多久…
② It was not ＋时间段＋before ...不久，就…
(动作已发生。)
例如： It was several hours before I found it.
① It will be＋时间段＋before 要过多久…才会…
② It will not be ＋时间段＋before 不久…就会…（动作未发生。）
例如：It will be three years before he finishes the work.
例如：
It was two years Macao returned to
China.
It won't be long before you him again.
It long before they escaped from the prison.
before
see
was
3、“It be ＋时间点＋when从句. 表示“在某时, 做某事”。
（1）、时态的运用：从句中时态与be一致.
It+ was+时间点+when-clause
① (be用一般过去时，从句谓语用一般过去时)
It+ will be+时间点+when-clause
② (be用一般将来时，从句谓语用一般现在时表将来)
It was already evening when he came back.
It will be midday when they get home
It was 1997 when Hongkong returned to China.
(2)、when在这里引导状语从句，意思是“当----时候”。
It was five o'clock when we arrived at the small mountain village.
It was 11 o'clock when he came back last night.
4、It be ＋介词＋时间点/段＋ that从句”为强调句型。
（1）、It+ be+…+that…是强调句。
It was at 11 o'clock that he came back last night.
= He came back last night at 11 o'clock.
(注意：看有没有介词）
It was 11 o'clock when he came back last night.
(2)、判断方法：去掉it、be和that，余下的部分仍是一个完整的句子，这样的句子一定是强调句。
①看时间前有没有介词（有介词是强调句）。
It was at five o'clock that we arrived at the small mountain village. （强调）
It was five o'clock when we arrived at the small mountain village.（状从）
②当表示时间的词后有没有副词。
It was 3 years ago that he joined the army.
③当时间副词是：last+时间；next+时间；this+时间；yesterday+时间tomorrow+时间; that+时间；等等。
It is next year that he will finish his work.
It is yesterday afternoon that he arrived.
It is that day that he understood the love of his parents.
1、It is almost five years_____ we saw each other last time
2、-Did Jack come back early last night？
-Yes. It was not yet eight o‘clock_______ he arrived home
A. before　　 B. when　 C. that　 D. until
3、It was some time______ we realized the truth
三、高考案例：
since
B
before
4.It was evening_______ we reached the little town of Winchester
5.Scientists say it may be five or six years______ it is possible to test this medicine on　human patients
6.It was______ I met Mr. Smith in London.
A. many years that　 　
B .for many years since
C. since many years ago when　　
D. many years ago that
before
before
D
7.-What was the party like？
-Wonderful. It‘s years____ I enjoyed myself so much.
8.It was about 600 years ago the first clock with a face and an hour hand was made.
A. that　 B. until C. before D. when
since
that
9、I’m sorry you’ve been waiting so long, but it’ll still be some time ____ Brian get back.
A. before B. since C. ill D. after
10、-Did Jack come back early last night？
-Yes. It was not yet eight o‘clock_______ he arrived home
before　 　 B. when　
C. that　 　 D. until
A
B