This's a pen and that's a ruler.

问题描述:

This's a pen and that's a ruler.
be 动词在什么情况下可以缩写什么时候不可以?

this is 不能缩写,that is 可以缩写.这个是英语中的规定.this is 缩写起来没办法读了,连个S连在一起.