1. Beware of a man of one book. 

2. Beware of a silent dog and still water. 

3. Beware the Ides of March.

4. It is good to beware by other men’s harm. 

5. When the fox preacheth, then beware your geese. 

6. Beware of Greeks bearing gifts.

7. Beware of him who regards not his reputation. 

8. Let the buyer beware.

9. Beware beginnings.

10. Beware,beware!he'll cheat'ithout scruple,who can without fear.

11. He told us to beware .

12. Beware of being too impatient with others.

13. Beware salespeople who promise offers that seem too good to be true.

14. Beware of the scalpers! You may get a fake ticket.

15. Beware of the dog.

16. Motorists were warned to beware of slippery conditions.

17. Beware of dishonest traders in the tourist areas.

18. Beware of the plausibility of salesmen!

19. Travelers must beware of fast traffic.

20. Motorists have been warned to beware of icy roads.

21. Swimmers should beware of strong tides.

22. Beware their patina of civility,(Sentencedict.com) it's only an act.

23. Beware of falling asleep while sunbathing.

24. Beware, this recipe is not for slimmers.

25. They should beware of making hasty decisions.

26. Police warned drivers to beware.

27. Parents of either sex should beware of imposing their own tastes on their children.

28. Holidaymakers should beware of using plastic cards in foreign cash dispensers.

29. Television commercials might seem more professional but beware of mistaking the gloss for the content.

30. Beware - poisonous chemicals.