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

     
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.