英语感叹句，乍看一下，相当简单，但对其中的两种感叹句型，how型和what型，当年老师也只是教我们如记数学公式一样，死记硬背而已，句型稍有变化，就无从下手了。

公式如下：

how+形容词/副词+a/an+名词+主+谓

what+a/an+形容词+名词+主+谓

现用类比法来分析

对于how和what，我们不熟悉，但我们可以分别用so代替how、such代替what来理解上述两种感叹句。

so是程度副词，such是限定词，故how词性相当于程度副词，what词性相当于限定词。

what句型感叹的是东西，how句型感叹的是程度。

1、可数名词单数

I have a beautiful bag.

what句型的变化由来

I have such a beautiful bag.

I have what a beautiful bag.

What a beautiful bag I have.

how句型的变化由来

I have so beautiful a bag.

I have how beautiful a bag.

How beautiful a bag I have.

2、可数名词复数

I have beautiful bags.

what句型的变化由来

I have such beautiful bags.

I have what beautiful bags.

What beautiful bags I have.

how句型的变化由来

I have so beautiful bags.

I have how beautiful bags.

How beautiful the bags I have.

3、不可数名词

I have dirty water.

what句型的变化由来

I have such dirty water.

I have what dirty water.

What dirty water I have.

how句型的变化由来

I have so dirty water.

I have how dirty water.

How dirty the water I have.

He is so good a boy that all of us like him.他是那么好的一个男孩，我们所有的人都喜欢他。

Very few developed economies are in so good a position.已没有几个发达经济体情况如此良好了。

It is so good a habit to instruct children to lay things where they belong when they are young.从小就教导孩子把东西放在该放的地方，这是一个好习惯。

She is a quite clever boy.

It is a rather hard work.

He says much such work is now under way around the word.他说世界上有许多像这样的工作在进行中。

They have made many such planes.他们制作了许多这样的飞机。