食物还在桌子上,他们为什么还没有吃掉呢?从字面的意思可以看出这是一个一般现在完成时的疑问句.现在完成时的构造：have(has) + 动词的过去分词 这是还没有吃掉,所以是否定句,在have后面加上not .haven't 是have 和not的缩写.吃(eat)的过去分词是eaten.
你的父亲是一名医生吗?是的,他是.他在城镇的一个医院里上班.当主语是第三人称的单数的时候,谓语动词要加上s .这里work是动词,He是主语 所以用works.
希望可以帮到你!
The food is still on the table.Why haven't they eaten it?中为什
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