2.There be 句型的否定形式：在be动词的后面加not(is not可以缩写为isn't，are not可以缩写为 aren't)把some 改成any。 例：There is a pencil in the pencil-box.(改为否定句) There isn't a pencil in the pencil-box.

There are some crayons on the desk.(改为否定句) There aren't any crayons on the desk.

3.“some”和“any”都有“一些”的意思.“some”一般用于肯定句，“any”用于否定句和一般疑问句。但在一些表示委婉请求，想得到对方肯定回答的疑问句中，也用“some”.

例：1.There are some watermelons in the basket.(肯定句)

2.There aren't any birds in the tree.(否定句)

3.Are there any toy trains on the table?(疑问句)

4.Would you like some tea?(表委婉请求)

4.can在否定句中的用法：表示某人不能做某事时，通常在can后面加否定词not, 后面加动词原形。 Bobby cannot(can’t) see any cakes in the fridge.

   5. 感叹句的结构：感叹句常用how或what来引导