These are used when you think something is probably true, but you cant be sure. 这些词可以用在当你认为某事可能是真的,但又不确定的时候。
The person who considers himself too old to learn something has probably always been that way. 认为自己太老了,就无法学习,那么他也许一直就是如此。
Could china have achieved what it has today had it been a country of free people and whether it would've better that way or are the people better off today is something we probably would never know. 我们也许永远也不会知道如果让这个国家的人民自由的话,中国能不能取得现在的成就,我们也不会知道如果换一种方式的话他们的人民会不会过的更好。
Something will probably happen within the next few months. 未来几个月很可能会发生转机。
But having less than five hours a night suggests something is probably not right. 改善睡眠质量和时间并非会使一个人身体状况更好,寿命更长。