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be動(dòng)詞的用法口訣
【速記口訣】I用am，you用are，is跟著他(he)、她(she)、它(it);單數(shù)形式用is，復(fù)數(shù)形式全用are。
變疑問，一提二改三問號(hào);變否定，更容易，be后not加上去。
【妙語(yǔ)詮釋】變疑問句時(shí)，可分三步進(jìn)行：第一步是”提“，指的是把句中的be動(dòng)詞提到主語(yǔ)前面;第二步是”改“，指的是把提到句首的be動(dòng)詞的首字母改成大寫字母，主語(yǔ)的首字母改成小寫字母(如主語(yǔ)是專有名詞則不改);第三步是”問號(hào)“，指的是在句末加上問號(hào)。
一，系動(dòng)詞be
be為連系動(dòng)詞，中心詞義是"是"，句型為"主+系+表"結(jié)構(gòu)。be的形式常用am, is, are(現(xiàn)在式);was, were(過去式);will/can/may/must be(助動(dòng)詞/情態(tài)動(dòng)詞+原形);have/has/had been(助動(dòng)詞+過去分詞)等。如：
To help animals is helping people.(一般現(xiàn)在時(shí))
The twins were very busy yesterday.(一般過去時(shí))
It will be sunny tomorrow.(一般將來(lái)時(shí))
She has been ill for over a week.(現(xiàn)在完成時(shí))
二，助動(dòng)詞be
助動(dòng)詞be，無(wú)詞義，輔助主要?jiǎng)釉~一起在句中作謂語(yǔ)動(dòng)詞。用法如下：
1. be+doing：構(gòu)成進(jìn)行時(shí)態(tài)，有現(xiàn)在和過去兩種進(jìn)行時(shí)態(tài)。如：
The girls is reading and copying the new words now.
Young Tom was always asking questions and trying out new ideas.
2. be+done：構(gòu)成被動(dòng)語(yǔ)態(tài)(主語(yǔ)是動(dòng)作的承受者，done必須是及物動(dòng)詞)。如：
Tea is grown in my hometown.(一般現(xiàn)在時(shí)的被動(dòng)語(yǔ)態(tài))
This building was built three years ago.(一般過去時(shí)的被動(dòng)語(yǔ)態(tài))
Our classroom has been cleaned and tidied already.(現(xiàn)在完成時(shí)的被動(dòng)語(yǔ)態(tài))
How could this kind of cakes be made in your home?(含情態(tài)動(dòng)詞的被動(dòng)語(yǔ)態(tài))
That is a day never to be forgotten.(動(dòng)詞不定式的被動(dòng)語(yǔ)態(tài))
3. be+going to do，表示"打算或?qū)⒁瞿呈?，be有現(xiàn)在和過去兩種形式。如：
We are going to plant trees in the park.
I didn't know if she was going to come here.
4. be+to do，表示"按計(jì)劃安排將要做某事"。如：
The new shop is not to be opened till next Monday.
One night an angel came to Mary and told her that she was to have this special boy.
三，be動(dòng)詞的用法there be句型
there be句式為：there be+主語(yǔ)部分+狀語(yǔ)部分，表示"某處存在某物"，be常用現(xiàn)在時(shí)，過去時(shí)和將來(lái)時(shí)等。如：
Oh, cool! And there are many things to see. There is even a deer park in Sanya.
There are about 80 pyramids in Egypt.
Will there be a football match in your school next week?
四，實(shí)義動(dòng)詞be
可以將be視為實(shí)義動(dòng)詞，因?yàn)樗哂袑?shí)際的詞義，如"成為;做;發(fā)生;舉行;逗留;到達(dá)"等。如：
His daughter wants to be a doctor for animals in her twenties.
Kate's birthday party will be at half past six this evening.
Jim has been in China for more than two years, but he has not yet been to Yichang.
以上be動(dòng)詞的用法的四個(gè)功能中，第一個(gè)功能最常見，第三個(gè)功能是考試的重點(diǎn)也是難點(diǎn)。為了方便大家對(duì)Be動(dòng)詞用法的記憶，小編還給大家總結(jié)了be動(dòng)詞的用法的常用口訣：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(hào)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。
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