1、Mike is shorter than Jim.（同义句）
Jim is taller than Mike.
2、Mary is 15 years old.Alice is 15 years old,too.（合并句子）
Both Mary and Alice are 15 years old.
3、She doesn't like to do the same things as me.（同义句）
She likes to do different things from me.
4、I am tall.My sister is tall,too.（合并为一句）
Both my sister and I are tall.
5、She isn't as famous as Zhang Ziyi.（用I think 合并句子）
I don't think she is as famous as Zhang Ziyi.