Correct mistakes in the following sentences: showed he us his library? It is yours? Offered he me a lift? Who does drink wine? You buy the manual yesterday? I am free now, isn't I? She likes her tea sweet, likes not she? They are very busy now, don't they? He is a student, is he? We are not late, do we?

Did he show his library? Is it yours? Did he offer me a lift? Who drinks wine? Did you buy the manual yesterday? Aren't i? Doesn' t she? Aren' t they? Isn' t he? Are we?