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 ti
