be动词怎么运用?
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e动词是am,is,are.它们的过去式是am,is-was,are-were.

有个口诀:I 后am,you 后are,is跟着他她它,单数后面用 is,复数后面定用 are .但是这个只能用在一般现在时

功能一,中心词义是"是",句型为"主+系+表"结构.be的形式常用am,is,are(现在式);was,were(过去式);will/can/may/must be(助动词/情态动词+原形);have/has/had been(助动词+过去分词)等.如:

To help animals is helping people.(一般现在时)

The twins were very busy yesterday.(一般过去时)

It will be sunny tomorrow.(一般将来时)

功能二,助动词be

助动词be,无词义,辅助主要动词一起在句中作谓语动词.用法如下:

1.be+doing:构成进行时态,有现在和过去两种进行时态.如:

The girls is reading and copying the new words now.

2.be+done:构成被动语态(主语是动作的承受者,done必须是及物动词).如:

Tea is grown in my hometown.(一般现在时的被动语态)

3.be+going to do,表示"打算或将要做某事",be有现在和过去两种形式.如:

We are going to plant trees in the park.

4.be+to do,表示"按计划安排将要做某事".如:

The new shop is not to be opened till next Monday.

功能三,there be

there be句式为:there be+主语部分+状语部分,表示"某处存在某物",be常用现在时,过去时和将来时等.如:

Oh,cool!And there are many things to see.There is even a deer park in Sanya.

功能四,实义be

可以将be视为实义动词,因为它具有实际的词义,如"成为;做;发生;举行;逗留;到达"等.如:

His daughter wants to be a doctor for animals in her twenties.

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