感叹句四大易错点：陈述句变感叹句一断二加三换位、a/an加不加、what和how互换条件
引言
感叹句的失分点集中在三处：陈述句变感叹句不知道往哪加、a/an 该不该加、what 和 how 怎么互换。今天一次讲清这三个易错点。
易错点一：陈述句变感叹句，一断二加三换位
```text
第一步：断——在谓语后面断开
The Christmas tree looks fantastic. → The Christmas tree looks / fantastic.
第二步：加——看断点前剩下的词性
剩下形容词/副词 → 加 how
剩下名词词组 → 加 what
第三步：换位——把感叹部分提到句首，主语谓语放后面
→ How fantastic the Christmas tree looks!
```
```text
再看两例：
It was an interesting film.
→ What an interesting film it was!
Emma sings very well.（well 是副词）
→ How well Emma sings!
```
易错点二：a/an 到底加不加
```text
规则：看 what 后面那个名词
- 单数可数名词 → 必须加 a/an
What a clever boy he is!
What an amazing smell it is!
- 复数名词 → 不加
What lovely flowers they are!
- 不可数名词 → 不加
What wonderful food it is!
What good weather!
```
易错点三：what 和 how 可以互换
```text
只有"单数可数名词"能互换，语序要调整：
What an interesting book it is!
= How interesting a book it is!（how + adj + a/an + 名词单数）
复数、不可数不能这样换：
What lovely flowers they are. ✓
How lovely flowers they are. ✗
```
易错点四：how 后面别接名词
```text
How a beautiful girl she is! ✗（how 不能直接接 a + 名词）
How beautiful the girl is! ✓（how + 形容词）
What a beautiful girl she is! ✓（what + 名词）
```
实战练习
```text
- The pancake tastes delicious.（变感叹句）
→ How delicious the pancake tastes!
- It is a very good idea.（变感叹句）
→ What a good idea it is!
- ______ bad weather it is! → What（不可数）
- ______ hard they are working! → How（副词）
- ______ an exciting match it was! → What
```
总结
```text
陈述句变感叹句：一断（谓语后）二加（看词性）三换位
a/an：单数可数必加，复数、不可数不加
互换：仅单数可数名词可用 how + adj + a/an + 名词
how 后面不接名词词组
口诀：断在谓语后，有名词用 what，只有形副用 how
```
```text
今日小抄：
How delicious the pancake tastes!
What a good idea it is!
What bad weather it is!（不可数不加 a）
How hard they are working!
```