Could you please explain what the difference between "boast of", "boast with", "boast about", and "boast sth" is? Please provide basic examples.
Which of these can be used interchangeably?

Question

Answer

"Boast of" and "boast about" are interchangeable, though "boast of" is a bit more formal. I've never heard the others.

Answer

The most common expression of the group is "boast about."

- He is boasting about his expensive car again.

- If you boast about your strength, someone might ask you to prove it.

- I used to boast about my jewelry collection until someone robbed me.

Good luck!