Here's the question, which comes from a listener named Cafer: Hi! Would you like to explain the difference between " can" and " be able to" ? Thank you.

你好！你能解释一下can和be able to的区别吗？谢谢。

Take Cafer for example, who says that he has improved his English and increased his vocabulary in three months that he's been studying with us.

以 Cafer 为例，他说他在和我们一起学习的三个月里， 他的英语水平提高了， 词汇量也增加了。