POSITIVE ( khẳng định), I'm reading a book., She's walking., He's swimming., They're playing football., It's running., NEGATIVE ( phủ định), I'm not reading a book., She isn't walking., He isn't swimming., They aren't playing football., It isn't running., question (câu hỏi), Am I reading a book?, Is he swimming?, Are they playing football?, What are they doing?, Where is he going?

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