So I decided to write a letter back to express my apology to him.
所以我决定给他写一封信来表达我的歉意。
First you read a letter from someone. After that you write back to them.
首先你读一封来自某人的信，然后你回信给他。
After I received his letter, I decided to write back.
收到他的信后，我决定给他回信。
After I received his letter, I decided to write back.
收到他的信后，我决定给他回信。
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