may可以表推测那为什么May there be any water in the bottle? 是错误的?
can可以表可能,那为什么This story can be true, but I hardly think it is是错误的?
must表肯定,那Must he be at home?错误吗?
用错了,不是不可以!There may be some water in the bottle.may 用在开头May the happiness follow you every where!(愿快乐与你同在!)can可以表示可能,但只用于肯定的情况,不能用于否定。must 不能用于疑问句!只能说 He must be at home....