Complete the tag questions

I wish I went swimming, _________________________.    
There is a cat sitting on the chair,_______________________
There are 4 people in my family, _______________________?
It seems that this river is polluted, ______________________?
Hai can play the piano,_______________________________
She thought that Jim loved her, ____________________?
Everything is ok,__________________________________?
Nobody called on the phone, __________________________?
They couldn’t understand him, ________________________?
He has helped nobody, _____________________________?
The children won't want to go to bed early, _____________?