l have already bought twenty bottle of beer ,they ought to b

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l have already bought twenty bottle of beer ,they ought to be enough for us two.
为什么要用ought to be 而不用may be 希望可以有具体的解释

表示比较肯定了.说明"它们应该对我们俩来说够了."
而不是它们可能对我们俩来说够了.
因为从前一句推断:我已经买了20瓶酒了.
说明的意象就是我都买了20瓶了,我想总够我们俩喝了吧.是比较确定了,所以用ought to be,而may be是可能,不够确定,不太符合上下文语意.

l have already bought twenty bottle of beer ,they ought to b ( ) a bottle of beer How many _________(bottle)of water have they?填什么,是bottle,还是b Tom bought a ( )of beer. The (twenty) floors of the building have been built already the waiter brought a bottle of beer to the man.改写成双宾语动词同义句转换1.The waiter brought a bottle of beer to the man2.he so 句子结构判定The waiter brought a bottle of beer to me. They ought to have finished their composition last Sunday ,_ Everything ______ into consideration,they ought to have anot should/ ought to have he has not finished yet.A:he ought to have .B;he ought to ha