01、一般现在时变否定句 肯定句:I am a student.(我是一名学生。) 否定句:I am not a student.(我不是一名学生。) 肯定句:She wants to be a teacher.(她想成为一名教师。) 否定句:She doesn't want to be a teacher.(她不想成为一名教师。) 02、一般过去式变否定句 肯定句:I was a teacher.(我是一名老师。) 否定句:I was not a teacher.(我不是一名老师。) 肯定句:She went to the park.(她去了公园。) 否定句:She didn't go to the park.(她没去公园。) 03、现在进行时变否定句 肯定句:We are making a cake.(我们正在制作蛋糕。) 否定句:We are not making a cake.(我们没在制作蛋糕。) 04、一般将来时变否定句 肯定句:I am going to read a book.(我打算去读一本书。) 否定句:I am not going to read a book.(我不打算读一本书。)