If you ignore any questions of using the appropriate grammar for your audience then they are interchangeable. The first and second are correct and appropriate for most any audience the second is incorrect grammatically but is often used in very informal settings.
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Dusan StojilkovicSo, in everyday speech I can use all 3?Yes, if you don't mind people thinking you don't know your grammar. As I said, number two is grammatically incorrect and should only be used in very informal settings. That means it should only be used in situations where the people around you use the same fractured grammar or they know you well and wil