例1 She is smiling sweetly.第三人称单数
否：She isn't smiling sweetly.
疑：Is she smiling sweetly?
例2 Mr Turner told us a funny story.第三人称单数
否：Mr Turner didn't tell us a funny story.
疑：Did Mr Turner tell us a funny story?
例3 It is a wet day today.第三人称单数
否：It isn't a wet day today.
疑：Is it a wet day today?
例4 They waited a long time.第三人称复数
否：They didn't wait a long time.
疑：Did they wait a long time?
例5 The dolphin is playing happily.第三人称单数
否：The dolphin isn't playing happily.
疑：Is the dolphin playing happily?
例6 China is the largest country in Asia.第三人称单数
否：China isn't the largest country in Asia.
疑：Is China the largest country in Asia?
例7 Nobody will agree to this project.这个也算第三人称单数吧
否：Somebody will agree to this project./Nobody won't agree to this project.
疑：Will anybody agree to this project?
例8 You'll be caught in the rain.第二人称单数或复数
否：You won't be caught in the rain.
疑：Will you be caught in the rain?
P.S.全要现在进行时态?那好,我帮你全改.I am a boy不是现在进行时,是一般现在时.你是不是要简单一点的句子?
例1 She is smiling sweetly.第三人称单数,现在进行时
否：She isn't smiling sweetly.
疑：Is she smiling sweetly?
例2 We love the movie.第一人称复数,一般现在时
否：We don't love the movie.
疑：Do we love the movie?
例3 I am a student.第一人称单数,一般现在时
否：I am not a student.
疑：Am I a student?
例4 They play the violin very well.第三人称复数,一般现在时
否：They don't play the violin very well.
疑：Do they play the violin very well?
例5 You are watching TV now.第二人称单数/复数（都可以）,现在进行时
否：You aren't watching TV now.
疑：Are you watching TV now?
例6 You finish your homework on time everyday.第二人称复数,一般现在时
否：You don't finish your homework on time everyday.
疑：Do you finish your homework on time everyday?
