We were pleased to hear from your letter of 6 August that you were impressed with our selection of toys.
我们很高兴收到你方8月6日来函得知你方对我们的玩具非常感兴趣。
I've got a problem and as I don't know what to do I thought I'd write to you and ask for your advice.
我有一个问题,因为我不知道该怎么办。我想我最好写信给你,征求你的意见。