Viết lại các câu sau sử dụng câu điều kiện 1, If you were to change your mind, I would be most grateful .............................................................................................. 2, If she decides to come, please telephone .............................................................................................. 3, If he had understood the problem, he wouldn't committed those mistakes ............................................................................................. 4, If I had known about those problems, I would never have moved here ............................................................................................. 5, If he had not resign, we would have been obliged to give him the sack ...............................................................................................