English is very useful ,____it?

--- She's never spoken to a foreigner, _______? --- Yes. She is active and can speak English freely.

---Emma has to stay at home to look after her little sister,  ? ---Yes, because her mother has gone to the supermarket.

—He’s never sung French songs before, has he? —___________. It’s his second time to sing in French.

— When I was young, I liked playing with toy animals. — ______.