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I work out every day.

I work out every day,don't I? I don't work out every day. Do I work out every day?

I am buying  a coat now.

I am buying  a coat now, aren't I?

I am not buying a coat now.

Am I buying a coat now?

I have never been a this shop before

I have never been a this shop before, have not I?

Have I never been a this shop before?

This is the most beautiful somg I have ever heard

This is the most beautiful somg I have ever heard, haven't I