主系表结构中存在的问题

主系表结构中存在的问题

I 句型的把握—容易与主系表混淆的几个句型，被动语态，现在与过去进行时态

1 there be 句型，只用来表示哪里有什么。

There is a bird on(in the tree. There are 50 students in our class. There (should, would ,willbe….

2主谓宾句型结构

They had become the victims of commercialization.

People are giving us another look. Mary keeps a diary.

Vast areas of land have become desert.

3主谓句型结构

Please stay here.

They appeared over the hill.

4 强调句型

It ’s exactly those kinds of skills that today ’s employers are looking for. It ’s because of me that make you lose.

5 被动语态：be+ 过去分词

The right to pursue happiness is promised to Americans by the US Constitution.

However, this freedom can easily be abused.

Everywhere they appeared, they were really welcomed .

II 时态混淆：和现在进行时和过去进行时混淆

be （am, is， are ）+doing现在进行时 be （was ，were ）+doing过去进行时。

We are raising children, not flowers. When I was having dinner with some friends, a similar incident happened.

A young man was driving home from work.

My hobby is swimming.

区分：现在进行时和过去进行时因为是时态问题，因此动词可以变换时态，而系表结构中的动词+ing形式

III 句型中的其他问题

表语与代主语：

It is disturbing to think that….

It is sure that the competition is more and more fierce.

IV 主谓一致—主语谓语在一般现在时态中单复数保持一致

The food taste so good!

My duty is to help the one who need help.

What surprised us was that he know many things for this topic.

Doing exercises every day keep her health.

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