Перевести предложения. Заранее Спасибо!!!!!

Those books are his. And these dictionaries are mine.
Are these pencil cases theirs or ours?
That question is very private.
Whose are these gloves?/Who does these gloves belong to?
It is a guitar. It is theirs.
That previous question was very difficult.
This is a spoken language, and that is a written language.