Sure! Here are the combined sentences with the appropriate transitional words and punctuation:

36. The football team should play better; otherwise, it may lose the match.

37. The weather is cold outside; however, I keep the windows open at night.

38. The two children were cooking for the first time; their food was terrible, but I enjoyed it.

39. You have to promise to study harder; otherwise, I won't help you with your study.

40. He was born in a poor family; however, he tried his best to get a good education.

41. He walked very slowly because he broke his leg in two places.

42. She has got a lot of money, for she is a Hollywood film star.

43. You must lend me the money for the trip; otherwise, I won't be able to go.

44. Laura is an honest person; however, I'm doubtful about her story of the incident.