换种方式表达下列各句。
1. John is taller than my sister.
My sister is ____________ ____________ ____________.
2. This desk is black.
This is ____________ ____________ ____________.
3. Tony has no time on Wednesday.
Tony ____________ ____________ on Wednesday.
4. It is colder in winter than in spring.
It is ____________ in ____________ than in ____________.
5. Sarah is ten years old. Amy is eight years old.
Amy is two years ____________ ____________ Sarah.