41 If you didn't save electricity, you would pay a lot of money.

42 If we had enough money, we would buy those new comics.

43 If she were free today, she would go to the movie with her friends.

44 If he weren't so lazy, he wouldn't fail the final exam.

45 If the weather were fine, the children would play outdoors.

46 If Thu could swim, she would go to the swimming pool with her friends.

41. You don't save electricity. You pay a lot of money.
If you didn't save electricity, you would pay a lot of money.
42. We don't have enough money, so we don't buy those new comics.
If we had enough money, we would buy those new comics.
43. She is not free today, so she can't go to the movie with her friends.
If she were free today, she could go to the movie with her friends.
44. He is so lazy. He fails the final exam.
If he weren't so lazy, he wouldn't fail the final exam.
45. The weather is not fine. The children don't play outdoors.
If the weather were fine, the children would play outdoors.
46. Thu cannot swim, so she doesn't go to the swimming pool with her friends.
If Thu could swim, she would go to the swimming pool with her friends.