be動詞的用法總結(jié)
大家在英語學習的時候經(jīng)常會對be動詞的用法感到疑惑，下面小編給大家對be動詞的用法做了總結(jié)，希望可以幫助到大家！
英語中有哪些be動詞
有am 、is 、was are、were、 being。
1、am,is和are用于不同的人稱和數(shù)。
am用于第一人稱單數(shù)。
例如:I am a teacher.我是一名老師。
is用于第三人稱單數(shù),沒有人和物的區(qū)別。
例如:—Who is he?—He is Tom’s father.
—What’s this?—It is a book.
are用于第二人稱單、復(fù)數(shù)和第一、三人稱的復(fù)數(shù)。
例如:You are a student. We are students, too.
2、am,is和are可以幫助構(gòu)成否定句和疑問句。
在am,is或are之后加上not,即將句子變成了否定句;
把be動詞提到句首,即將句子變成了疑問句。
例如:I’m from China. →I’m not from China. →Are you from China? (對I am的提問比較特別)
He’s thirteen years old.→He isn’t thirteen years old.→Is he thirteen years old?They are policemen. →They aren’t policemen. →Are they policemen?
看了以上例句,一定要注意am,is和are在句中的縮寫形式。另外,am,is,are與this,these,those在一起時一般不縮寫。
3、be也可以位于句首,表示向別人提出要求。
例如: Be a good student! 做個好學生!
be動詞有哪些用法
一、系動詞be 作為系動詞(也叫連系動詞，link verb)的be，是英語學習者接觸最早的用法，而且其用法也很多。其基本含義為“是”，基本用法結(jié)構(gòu)為“主語+be+表語”，也就是我們常說的主系表結(jié)構(gòu)，其中的表語一般都由名詞、形容詞、數(shù)詞或表地點、時間等的短語來充當。 系動詞be有各種時態(tài)的變化，也會和情態(tài)動詞連用。
(一)be的時態(tài)變化 系動詞be會有一般現(xiàn)在時、一般過去時、一般將來時、現(xiàn)在完成時、過去完成時等的時態(tài)變化。
如：He isa student.They werein the park yesterday.It will be cloudy tomorrow.He has been ill for six days.It had been three hours before she left the hat shop.
(二)be與情態(tài)動詞的連用 其用法為：情態(tài)動詞+系動詞be原形。如：It must be Lucy's book. Her name is on the cover.It can be very difficult for us to memorize too many words within such a short time.She should be here on time tomorrow.
二、助動詞be 作為助動詞，be沒有具體含義，而是與主要動詞一起構(gòu)成句子的謂語動詞。這種情況下，be主要用來構(gòu)成進行時和被動語態(tài)。
(一)進行時態(tài)中的be 此時，be可以與主要動詞的現(xiàn)在分詞一起，構(gòu)成各種進行時態(tài)。如：He is reading in the library now.(現(xiàn)在進行時)She wasswimming in the river this time yesterday.(過去進行時)They will be arriving in Beijing tomorrow.(將來進行時)We have been learning English for ten years.(現(xiàn)在完成進行時)
(二)被動語態(tài)中的be 助動詞be能夠與主要動詞的過去分詞一起構(gòu)成被動語態(tài)，即be done結(jié)構(gòu)。如：Chinese iswidely used around the world nowadays.The window wasbroken by the naughty boy just now.Your watch has already beenrepaired.【注意】 助動詞be能夠構(gòu)成特殊句型。如：
1、be going to do be going to do表示“打算或?qū)⒁薄?/p>
如：He is going to visit us next week. It isgoing to rain soon.
2、be about to do be about to do表示“剛要，即將”。與be going to do表“將要”不同的是，be about to do表示的是說完話后馬上就要去做或是短期內(nèi)馬上就要去做。
如：The plane isabout to take off in five minutes' time.
3、be to do be to do表示“按計劃要做”。
如：One night an angel came to Mary and told her that she wasto have this special boy. The new store isto be opened tomorrow.
三、特殊句型中的be
(一)There be句型 與上面用法都不同的是，be可以與there一起構(gòu)成there be句型，用來表示存在?？紤]到There be句型較為重要，內(nèi)容較多，在此不做贅述，后面再找時間跟大家單獨分享。今天就先給幾個常見的例句。 There is a white ruler on the desk. There were a great many people in the car race last year.
(二)祈使句中的be 這種情況下，句子一般以Be開頭或是Don't be開頭，表示命令或建議等。如： Bepatient! (耐心點!) Don't be so hard on me! (不要對我們這么嚴厲!)
(三)虛擬語氣中的be be有時可以放在句首，引起虛擬語氣。如：Be he rich or poor, she will marry him.Be it true or not, she will see it herself.此時的be引導的句子其實相當于一個讓步狀語從句。以上兩句話就相當于：Whether he be rich or poor, she will marry him. (無論他是否有錢，她都會嫁給她。)Whether it be true or not, she will see it herself. (無論這是否是真的，她都會親自去見證。)
Be動詞的用法口訣 :
我用am，你用are，is連著他，她，它；
單數(shù)名詞用is，復(fù)數(shù)名詞全用are。
變疑問，往前提，句末問號莫丟棄。
變否定，更容易，be后not莫忘記。
疑問否定任你變，句首大寫莫遲疑。
be動詞練習題
1. I ______ a boy. My name ______ Li Lei.
2. My mobile phone(手機) number ______ 13053738109.
3. Jim and I ______ in the same school.
4.-What ______ three plus one? -It ______ four.
5. ____ you Mike?
Key:
1. am, is 2. is 3. are 4. is, is 5. Are
在橫線上填上合適的be動詞。(am,is,are)
1、Helen____ a student
2、This _____my book.
3、My father______a cook.
4、Jack’s friend____in the study.
5、Your mother_____ swimming.
6、Your sister______in the study.
7、Those jackets_______my sister’s.
8、That______her dog.
9、The cat_______on the desk.
10、The books_______under the table.
11、His sisters______running.
12、This train____for Shanghai.
13、The dress______too big.
14、This book______for you.
15、The waitress______my mother.
16、Those grapes________green.
17、The children________singing.
18、Helen and I______in the classroom.
19、I _____a doctor.
20、______you a nurse?Yes, I am.
從下列各題后所給的四個選項中選擇最佳答案填空。
1. My father _______ ill yesterday.
A. isn't B. aren't C. wasn't D. weren't
2. _______ your parents at home last week?
A. Is B. Was C. Are D. Were
3. The twins _______ in Dalian last year. They _______ here now.
A. are; were B. were; are
C. was; are D. were; was
4. _______ your father at work the day_____yesterday?
A. Was; before B. Is; before
C. Was; after D. Is; after
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