За 15 ! мне нужно предложения на to be. 6 предложений 3 отрицательных и 3 положительных! кто сделает тому спа си бо !

... Is my mum
My favorite book is
You are very good boy

We are happy!
winter is a frosty season.
I am good at Maths.

They aren't good students.
He isn't at school today.
The cat is very fat.