Помогите, пожалуйста!
напишите следующие предложения во множественном числе, изменяя также форму глагола to be:
1. This is my pen and that is your pencil.
2. This is our office and that is yours.
3. This is his desk and that is hers
4. This is my book and that is theirs
5. This is my letter and that is yours
6. Is this is my book?
7. Is that house yours?