Hi Young! Thank you for submitting your homework. I appreciate it a lot. Please see my corrections below.

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Young: Yesterday, My car air conditioner did't work. The weather was so hot so I had to go to garage immediately. Repair man told that it take 50 dollar. I felt blue because I got to spend money all of a sudden. 30 minute later, Repair man told again that your car have serious damage. If you would like to repair a car, you should pay 300 dollar. I was dumbfounded because it was so expensive. I said to him that it was so expensive and he told that if you pay with the cash not credit card, i would discount 50 dollar. Althought I thought that repair man rip me off my money, i should pay the moneny because i want to fixed my car.

Correct: Yesterday, my car's airconditioner didn't work. It was so hot so I went to the garageimmediately. The mechanic told me that it costs 50 dollars. I feltblue because I have to spend money all of a sudden. After 30 minutes,the mechanic told me that my car has a serious damage."If you want us to repair your car, you should pay 300 dollars.", he said. I was dumbfounded because it was so expensive. I told him that it costs too much. He replied, "If you will pay cash, I will give you a 50 dollar discount." Although I thought that the mechanic will rip off my money, I paid the needed amount because I want my car to be fixed.

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Way to go, Young! :)