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Let表示“间接命令或愿望”，后面接第三人称代词作宾语。
Let him work out the problem by himself.
Let Li Ping be monitor.
感叹句表示说话时的惊讶、喜悦、气愤等情绪，带有强烈的感情色彩。感叹句主要有两种：
What + 名词词组;
What a beautiful day it is!
How + 形容词或副词
How well they have learned English!
How well he swims!
注意：
What 修饰单数可数名词时，如果这一名词有形容词修饰，也可以用how来引导感叹句，但是不定冠词a, an要放在形容词的后面。
What a beautiful park!
How beautiful a park it is!
补充练习
按要求进行句型转换
1. We have many cakes for supper (变为否定疑问句)
2. I would like a cup of tea, please. (变为一般疑问句)
3. He is a teacher, (a student) (改为选择疑问句)
4. It is a nice box. (改为感叹句)
5. The workers are working hard. (改为感叹句)
6. Tom is sitting on the desk. (改为否定的祈使句)
7. Everything is ready, ___________ ? (以下改为反意疑问句)
8. This isn’t your book, _____________ ?
9. Don’t look out of the window, _____________ ?
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