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If you may If you do If not If so
as soon as you have entered the shop before you start browsing only when you have finished browsing when you have finished browsing
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can you have you do you did you
have you borrowed this book you have borrowed this book have you kept this book you have kept this book
how you have observed how what you have observed that you have observed how that you have observed
have you borrowed this book you have borrowed this book you have kept this book have you kept this book
haven't you hadn't you had you have you
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the books are very attractive you have started reading an interesting book it is raining outside you have to make sure you don't buy a dull book as a present
Did you pay Have paid for Have you paid Have you bought