1. How can she be so petty?

2. He seems to take delight in petty cruelty.

3. He got the sack for petty thieving.

4. The removal of petty restrictions has made life easier.

5. Some of the prison officers were petty tyrants.

6. Big business will never let petty nationalism get in the way of a good deal.

7. It was a petty problem and they soon solved it.

8. We have been chafing under petty regulations for too long.

9. He became involved in petty crime as a teenager.

10. Some petty bureaucrat wanted all the documents in triplicate.

11. Take the money for stamps out of petty cash.

12. These petty rules can lead to frustration and anger.

13. I hate being fettered by petty rules and regulations.

14. She grew tired of his petty jealousies.

15. She felt boxed in by all their petty rules.

16. He descended to a life of petty crime.

17. She is above petty gossiping.

18. I think that attitude is a bit petty.

19. I'm tired of her petty jealousies.

20. They were nothing but petty thieves .

21. My life is hedged about with petty regulations.

22. Britain is suffering an epidemic of petty crime.

23. Away with all these petty restrictions!

24. Petty pilfering is on the increase in super market.

25. It is not true suffering ennobles the character; happiness does that sometimes, but suffering, for the most part,(http://sentencedict.com/petty.html) makes men petty and vindictive. 

26. Prisoners complain that they are subjected to too many petty rules and restrictions.

27. Most of us, however, take life for granted. We know that one day we must die, but usually we picture that day as far in the future. When we are in buoyant health, death is all but unimaginable. We seldom think of it. The days stretch out in an endless vista. So we go about our petty tasks, hardly aware of our listless attitude toward life.

28. He was miserable all the time and rows would start over petty things.

29. Man's dearest possession is life. It is given to him but once, and he must live it so as to feel no torturing regrets for wasted years, never know the burning shame of a mean and petty past; so live that, dying, he might say: all my life, all my strength were given to the finest cause in all the world--the fight for the Liberation of Mankind.

30. A team of officers is trawling through the records of thousands of petty thieves.