21. Not only was he a thief, but he was also a murderer.

22. Not only are you funny, but you are also witty.

23. No sooner had he left the office than the telephone rang.

24. No sooner had she just put up her umbrella than the rain came down in torrents

25. No sooner had he returned from his walk than he got down to writing the letter.

26. No sooner had his appointment posted than the new editor fell ill

27. Only if John fails the exam, will he take it again.

28. Only if I arrive early, will I help you get thing ready

29. Only if pollutions increases, will more and more trees die.

30. Only if we try to control pollution, will it very expensive.

31. Had it not been for the attendance of a famous film star, the party wouldn't have been a success.

32. Heavy as it was raining, none of the workers came late

33. Bad as the weather was, we went camping.

34. Unknown as how the blocks were put in a place, several theories have been proposed

35. Low as the salary was, I decided to accept the job

36. Hard as I worked all day, I was not tired

37. So expensive was the Picasso painting that nobody could buy it

38. So great was the demand that they had to repaint the book immediately

39. So foggy was the weather that all the flights were cancelled

40. So enthusiastic was he in his research that he spent most time on his day-to-day work.