把每一句都写出否定句,一般疑问句,肯定回答,否定回答答:I can't swim in the river Can you swim in the river? Yes, I can No, I can't She can't speak English Can she speak English? Yes, she can, No, she can't I am not a teacher Are you a teacher? Yes, I am No, I am not They aren't students Are the...