Can is the most commonly used modal verb. While it has many different uses, the most common use is to denote ability. Let’s look at some examples:

  • I can speak four different languages fluently.
  • Your cat can jump really high!
  • They can design your website.

Another way in which can is commonly used is to ask for permission in an informal way.

  • Can I borrow your blue dress?

Finally, can, when negated, can be used to describe something unbelievable. 

  • You can’t be breaking up with me on my birthday!