Помогите пожалуйста!!!Вставьте подходящую форму глагола to be в настоящем времени.     John ...

Помогите пожалуйста!!!
Воткните подходящую форму глагола to be в истинном медли.


John ... in the garden now.
Kate and Pete ... not English.
... your friend an economist?
My mother ... not an expert.
... they from London?
We ... not good economists yet.
I... at the University today.
My son ... a student.
I... not a mathematician.
You ... in the street now.