Present Perfect +
I/play/football before.
I have played football before.
My dad/ not travel / to the US /before.
My dad hasn't traveled to the US before.
you/walk/dog/?
Have you walked the dog?
She/study/for the English exam.
She has studied for the English exam.
They /not study/for the science exam.
They have not studied for the science exam.
you/ever/call/for an ambulance?
Have you ever called for an ambulance?
We/just/get back/from/our holidays
We/just/get back/from/our holidays
Susan and Mark /never/perform/the dance.
Susan and Mark have never performed the dance.
you/ever/be/San Francisco?
Have you ever been to San Francisco?