1. Stop fooling about with that knife!

2. Stop fooling about with that knife of someone will get hurt.

3. Don't fool about with another man's wife.

4. He just fools about all day long.

5. Stop fooling about,you have serious work to do.

5. is a sentence dictionary, on which you can find good sentences for a large number of words.

6. Stop fooling about, man.

7. If you fool about with matches, you'll end up getting burned.

8. You shouldn't have let the children fool about / around with dangerous chemicals.

9. Stop fooling about with that knife or someone will get hurt.

10. Why must you fool about all day?

11. It is ridiculous for you to fool about that way.

12. If you go to college, you must work hard, not fool about.