外研版（2019）高中英语必修第一册 Unit1 A new start单元语法详解课件（一）（12张）
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| 名称 | 外研版（2019）高中英语必修第一册 Unit1 A new start单元语法详解课件（一）（12张） |  | |
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| 文件大小 | 1.3MB | ||
| 资源类型 | 教案 | ||
| 版本资源 | 外研版（2019） | ||
| 科目 | 英语 | ||
| 更新时间 | 2023-02-25 21:09:12 | ||
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(共12张PPT)
Unit1 A New Start
单元语法详解(一)
两个奇妙的句式
﹤
1. be about to do sty. When…
2. must have done sth.
原创 Cao
2021, 4
● be about to do sth. when…正要做某事，这时（突然）
发生了另一件事
【原句重现】
I was looking at the photos on the noticeboard when I heard
a voice behind me.
【精品例句】
a. The teacher was about to say when a student interrupted
老师正要讲话，这时（突然）一个学生插嘴了
b. Tom was about to go out for a walk when the bell rang.
汤姆正要出去散步，这时（突然）电话响了
c. I was about to go to school when it began to rain.
我正要去上学，这时（突然）天下雨了
d. They were about to go home when the boss stopped them
他们正要回家，这时老板挡住了
e. I was about to say “hi” to her when she turned her head
in the other direction.
我正要向她问好，她突然把头转向另一个方向
温馨告知：这里的 when 是并列连词，表示“这时,突然…”, when的
这种用法也常见于以下相关句式中
句式拓展
(1) be doing sth. when…
正在做…这时（突然）发生了…
【精品例句】
The smiths were spending their holidays in Paris when a terrible
tsunami happened.
史密斯一家正在巴黎度假，突然发生了海啸
b. Lucy was walking through the village when she was bitten on the
left leg by a dog.
路西正走过村庄，突然被一只狗咬伤了左腿
c. I was walking along the river when I heard a drowning boy cry
for help.
我正在河边走，突然听到一个溺水男孩求救
(2)be on the point of doing sth. when…
=be about to do sth. when…
正要做某事，这时（突然）发生了…
【精品例句】
a. The professor was on the point of going to the library when
a student called him.
教授正要去图书馆，这时一个学生突然来电话了
b. Mary was on the point of watching TV when the light went
out suddenly. 玛丽正要看电视，这时突然停电了
c. The old man was on the point of going downstairs when his
grandson caught him by the arm.
这位老人正要下楼，他孙子突然抓住了他胳膊
(3)had just done sth. when…
刚刚做完某事，这时（突然）发生了…
【精品例句】
a.I had just finished my test paper when the bell rang, announcing
the exam was over.
我刚做完试卷，这时突然铃响了，宣布考试结束
b.John have just finished my homework when his father called him yesterday.
约翰刚做完作业，这时突然他父亲给他打电话了
c. The lady had just locked the door when she realised she had left her key on the kitchen table .
这位女士刚把门锁上突然意识到把钥匙落在厨房桌子上了
(4)be going to do sth. when …
将要做某事，这时（突然）发生了…
【精品例句】
a. Alice was going to start out when it snowed heavily.
爱丽丝就要出发，突然天下大雪了
b. We were going to begin the next topic when someone broke in.
我们将要开始下一个话题，突然有人闯了进来
c. We were going to sleep when someone knocked at the door.
我们正准备出去散步，突然有人敲门
悄悄告诉你：be going to do sth. when …在意义上接近于前面讲述的
be about to do sth. when…和 be on the point of doing sth. when…
即学即练: 从 A、B、C、D 四个选项中选出最佳选项
1. I was walking along the road ____suddenly someone patted on the shoulder from behind.
A. when B. while C. as D. what
2. We were about to start ____ it began to rain.
A. how B. which C. whenever D. when
3. Tom was doing his homework ____ a stranger came in.
A. what B. when C. where D. how
4. He had just fallen asleep ____ the bell rang.
A. whether B. whose C. when D. as
5. These students were on the point of going out of the classroom ____ it rained cats and dogs.
A. while B. how C. where D. when
6. Edison was going to help him ______ suddenly he disappeared.
A. when B. if C. what D. while
A
D
B
C
D
A
● must have done sth. 表示对过去事情的肯定推测
【原句再现】You must have had some moments when you were disappointed.
must 表“推测”时只用于肯定句中，语气较强，常作 “一定，肯定”之意, 既可对
现在情况推测，也可对过去情况推测。
① must do…表示对现在情况推测。
② must have done…表示对过去情况推测. 例如：
【精品例句】
a. You must be very thirsty after thirty minutes’ walk. （对现在情况推测）
b. They must have arrived by air yesterday afternoon.(对过去情况推测)
c. Your mother must be doing housework now. （对现在情况推测）
d. It must have rained here last night. (对过去情况推测)
轻轻告诉你：表肯定推测也可用 may/might, 但语气比 must 弱，常表示“可能”，
如：
a. He may have gone swimming yesterday afternoon. 昨天下午他可能去游泳了
b. Today is Saturday . He may be at home. 几天是周六，他可能在家吧
句式拓展
★表示否定推测常用 can’t/couldn’t…
can’t do … 表示对现在或将来情况的否定推测
can’t/couldn’t have done..表示对过去情况的否定推测
【精品例句】
The man standing over there can’t be David, for he has gone abroad.
站在那边的那个人不肯是大卫，因为他已经出国了
b. The ninety-year-old man can’t/couldn’t have gone that far yesterday.
这位九十高龄的老人昨天不可能走那么远
★表示疑问推测常用 Can/could…
Can …do… 表示对现在情况的疑问推测
Could…have done… 表示对过去情况的疑问推测
【精品例句】
-- Someone is knocking at the door. Can it be Tang Ling 有人敲门，可能是唐玲吗？
-- It can’t be her because she has gone to Paris.不可能是她，她去巴黎了
b. Could he have been dismissed by his boss last week 他上周可能被老板解雇了吗？
即学即练: 从 A、B、C、D 四个选项中选出最佳选项
1. I’m sure that he ______ come here before ten this morning.
A. need B. may C. must D. might
2. --___ Mary arrive here before three -- I’m afraid she _____
Must; may B. Can; can C. Can; may D. Can; can’t
3. The door was locked that day, so he ____ at home.
mustn’t have been B. may have been
C. needn’t have been D. can’t have been
4. Look! The ground is wet. It ___ heavily last night.
can rain B. can have rained C. must have rained D. can’t have rained
5. Your mother ____ be waiting for you now.
need B. must C. will D. would
6. Harry is feeling uncomfortable. He ___too much at the party last night (辽宁卷）
A. must have drunk B. can drink C. can’t have drunk D. can’t drink
C
D
D
C
B
A
Unit1 A New Start
单元语法详解(一)
两个奇妙的句式
﹤
1. be about to do sty. When…
2. must have done sth.
原创 Cao
2021, 4
● be about to do sth. when…正要做某事，这时（突然）
发生了另一件事
【原句重现】
I was looking at the photos on the noticeboard when I heard
a voice behind me.
【精品例句】
a. The teacher was about to say when a student interrupted
老师正要讲话，这时（突然）一个学生插嘴了
b. Tom was about to go out for a walk when the bell rang.
汤姆正要出去散步，这时（突然）电话响了
c. I was about to go to school when it began to rain.
我正要去上学，这时（突然）天下雨了
d. They were about to go home when the boss stopped them
他们正要回家，这时老板挡住了
e. I was about to say “hi” to her when she turned her head
in the other direction.
我正要向她问好，她突然把头转向另一个方向
温馨告知：这里的 when 是并列连词，表示“这时,突然…”, when的
这种用法也常见于以下相关句式中
句式拓展
(1) be doing sth. when…
正在做…这时（突然）发生了…
【精品例句】
The smiths were spending their holidays in Paris when a terrible
tsunami happened.
史密斯一家正在巴黎度假，突然发生了海啸
b. Lucy was walking through the village when she was bitten on the
left leg by a dog.
路西正走过村庄，突然被一只狗咬伤了左腿
c. I was walking along the river when I heard a drowning boy cry
for help.
我正在河边走，突然听到一个溺水男孩求救
(2)be on the point of doing sth. when…
=be about to do sth. when…
正要做某事，这时（突然）发生了…
【精品例句】
a. The professor was on the point of going to the library when
a student called him.
教授正要去图书馆，这时一个学生突然来电话了
b. Mary was on the point of watching TV when the light went
out suddenly. 玛丽正要看电视，这时突然停电了
c. The old man was on the point of going downstairs when his
grandson caught him by the arm.
这位老人正要下楼，他孙子突然抓住了他胳膊
(3)had just done sth. when…
刚刚做完某事，这时（突然）发生了…
【精品例句】
a.I had just finished my test paper when the bell rang, announcing
the exam was over.
我刚做完试卷，这时突然铃响了，宣布考试结束
b.John have just finished my homework when his father called him yesterday.
约翰刚做完作业，这时突然他父亲给他打电话了
c. The lady had just locked the door when she realised she had left her key on the kitchen table .
这位女士刚把门锁上突然意识到把钥匙落在厨房桌子上了
(4)be going to do sth. when …
将要做某事，这时（突然）发生了…
【精品例句】
a. Alice was going to start out when it snowed heavily.
爱丽丝就要出发，突然天下大雪了
b. We were going to begin the next topic when someone broke in.
我们将要开始下一个话题，突然有人闯了进来
c. We were going to sleep when someone knocked at the door.
我们正准备出去散步，突然有人敲门
悄悄告诉你：be going to do sth. when …在意义上接近于前面讲述的
be about to do sth. when…和 be on the point of doing sth. when…
即学即练: 从 A、B、C、D 四个选项中选出最佳选项
1. I was walking along the road ____suddenly someone patted on the shoulder from behind.
A. when B. while C. as D. what
2. We were about to start ____ it began to rain.
A. how B. which C. whenever D. when
3. Tom was doing his homework ____ a stranger came in.
A. what B. when C. where D. how
4. He had just fallen asleep ____ the bell rang.
A. whether B. whose C. when D. as
5. These students were on the point of going out of the classroom ____ it rained cats and dogs.
A. while B. how C. where D. when
6. Edison was going to help him ______ suddenly he disappeared.
A. when B. if C. what D. while
A
D
B
C
D
A
● must have done sth. 表示对过去事情的肯定推测
【原句再现】You must have had some moments when you were disappointed.
must 表“推测”时只用于肯定句中，语气较强，常作 “一定，肯定”之意, 既可对
现在情况推测，也可对过去情况推测。
① must do…表示对现在情况推测。
② must have done…表示对过去情况推测. 例如：
【精品例句】
a. You must be very thirsty after thirty minutes’ walk. （对现在情况推测）
b. They must have arrived by air yesterday afternoon.(对过去情况推测)
c. Your mother must be doing housework now. （对现在情况推测）
d. It must have rained here last night. (对过去情况推测)
轻轻告诉你：表肯定推测也可用 may/might, 但语气比 must 弱，常表示“可能”，
如：
a. He may have gone swimming yesterday afternoon. 昨天下午他可能去游泳了
b. Today is Saturday . He may be at home. 几天是周六，他可能在家吧
句式拓展
★表示否定推测常用 can’t/couldn’t…
can’t do … 表示对现在或将来情况的否定推测
can’t/couldn’t have done..表示对过去情况的否定推测
【精品例句】
The man standing over there can’t be David, for he has gone abroad.
站在那边的那个人不肯是大卫，因为他已经出国了
b. The ninety-year-old man can’t/couldn’t have gone that far yesterday.
这位九十高龄的老人昨天不可能走那么远
★表示疑问推测常用 Can/could…
Can …do… 表示对现在情况的疑问推测
Could…have done… 表示对过去情况的疑问推测
【精品例句】
-- Someone is knocking at the door. Can it be Tang Ling 有人敲门，可能是唐玲吗？
-- It can’t be her because she has gone to Paris.不可能是她，她去巴黎了
b. Could he have been dismissed by his boss last week 他上周可能被老板解雇了吗？
即学即练: 从 A、B、C、D 四个选项中选出最佳选项
1. I’m sure that he ______ come here before ten this morning.
A. need B. may C. must D. might
2. --___ Mary arrive here before three -- I’m afraid she _____
Must; may B. Can; can C. Can; may D. Can; can’t
3. The door was locked that day, so he ____ at home.
mustn’t have been B. may have been
C. needn’t have been D. can’t have been
4. Look! The ground is wet. It ___ heavily last night.
can rain B. can have rained C. must have rained D. can’t have rained
5. Your mother ____ be waiting for you now.
need B. must C. will D. would
6. Harry is feeling uncomfortable. He ___too much at the party last night (辽宁卷）
A. must have drunk B. can drink C. can’t have drunk D. can’t drink
C
D
D
C
B
A