1. I am writing to confirm /enquire/inform you…
我写信时要确认/询问/通知你…
2. I am writing to follow up on our earlier decision on the marketing campaign in Q2.
我写信来追踪我们之前对于第二季度营销活动的决定。
3. With reference to our telephone conversation today…
关于我们今天在电话中的谈话。
4. In my previous e-mail on October 5…
先前在10月5日所写的信…
