he often eats pears.怎么改为否定句.eat应该加S还是不加S为什么
问题描述：
he often eats pears.怎么改为否定句.eat应该加S还是不加S为什么
答
He doesn't often eat pears.
前面的does已经体现了时态,所以后面的动词不再加s.