mary eats pears every day改为否定句

mary eats pears every day改为否定句 Ann eats pears every day.改为否定句 Tom eats ice cream every day.改为一般否定句 mary likes pears.(改为否定句) Mona eats lots of healthy food every day.改为一般疑问句和否定句 My son eats some apples every day.(改为否定句） My grandmother eats fruit every day .(否定句） Mary gets up early and does morning exercises every day改为否定句 Tom eats many vegetables every day.【改为同义句】 He eats lots of fruit every day.改为同义句 Water it every day.改为否定句 he often eats pears.怎么改为否定句.eat应该加S还是不加S为什么