They are talking about their hoildays.The girl is doing her homework in the library.Mr.Black comes from France.Gao Shan speaks French very well.There is a football under the table.怎么变反问句

They are talking about their hoildays,aren't they?
The girl is doing her homework in the library,is she?
Mr.Black comes from France,doesn't he?
Gao Shan speaks French very well,doesn't she?
There is a football under the table,isn't there?