he may have lunch ...may后跟动词原形
i'm not sure if he is ill.形容词需加be动词
he can't have jumped at that moment.jump是短暂性动词,所以不加been.
i think that you must have been the fastest of all.注意你的拼写错误.
he may have lunch ...may后跟动词原形
i'm not sure if he is ill.形容词需加be动词
he can't have jumped at that moment.jump是短暂性动词,所以不加been.
i think that you must have been the fastest of all.注意你的拼写错误.