be able to 和can的区别：
1、当它们表示能力的时候，是一样的。
2、 can只有两种时态，即can 和could， 而be able to 有多种时态，如was/were able to, will/shall be able to, have/has been able to等。
3、表示过去通过努力终于做成了某事要用be able to，而不能用can。
4、can能表猜测，be able to不能。can的这种用法主要用于疑问句和否定句。
5、can 可以表 “允许”, 与may可以互换, 此时不能用be able to 代替。
拓展资料
be able to
1、We may be able to design a course to suit your particular needs
我们或许可以专门设计一门课程以满足你的特殊需求。
2、He may be able to leave hospital early next week.
他下周初也许就可以出院了。
3、Scientists would soon be able to manipulate human genes to control the ageing process.
科学家们很快将能通过操控人类基因来控制衰老过程。
4、They'll be able to furnish you with the rest of the details.
他们将可向你提供其余的细节。
5、One will never be able to understand why these political issues can acquire such force
人们永远也不会明白为什么这些政治问题会有如此大的影响力。
6、They should be able to find you the best package to suit your needs.
他们应该能提供满足你需要的最佳套餐。
can
1、You can imagine he was terribly upset
你能想象得出来，他当时心里乱得要命。
2、How can you complain about higher taxes?
你怎么能抱怨税费的提高呢？
3、Several young men were kicking a tin can along the middle of the road.
几个青年人踢着一个锡罐在路中间走着。
4、With another day's work in the can, Philip is happy to leave the open countryside and head for his London flat.
又干完了一天的活，菲利普满心愉悦地离开了广袤的乡村，前往自己位于伦敦的公寓。
5、Luckily, iron can be reworked and mistakes don't have to be thrown away
所幸的是，铁可以再加工，次品、废品不必被扔掉。
6、A central reservation number operated by the resort can direct you to accommodations that best suit your needs
该旅游胜地开设的预约中心电话可指引你找到最适合你的住处。
7、A selected list of some of those stocking a comprehensive range can be found in Chapter 8.
第8章选列了一些备货品种齐全的商家