1.We need plenty of fresh fruit every day.改否定句 2.I should drink a lot of water every day.改否定句 3.Sue's diet is as healthy as her sister's diet.用陈述句表达相反意义 4.Your diet is unhealthy than mine.保持句意不变
we don't need plenty of fresh fruit every day I shouldn't drink a lot of water every day Sue's diet isn't as healthy as her sister's diet my diet is healthier than yours