当你到达美国的时候，写封信给我。

Drop me a line when you get to the United States.

youdao

一定早点写封信给我。

Do write me soon.

youdao

你到那儿后给我写封信。

Drop me a line when you get there.

《牛津词典》

给我们写封信，能收到你的信总是让人很高兴。

Drop us a line, it's always great to hear from you.

《柯林斯英汉双解大词典》

想起来了，我今天应该给我儿子写封信了。

Come to think of it, I should write to my son today.

youdao

我打算给我的女朋友写封信。

I mean to write a letter to my girlfriend.

youdao

等你知道了考试结果，给我写封信。

Drop me a line when you know your exam results.

youdao

我要给我北京的朋友写封信。

I will write a letter to a friend in Beijing.

youdao

我想给我在美国的朋友们写封信。

I want to write to my friends in the USA.

youdao

他本来应该给我们写封信的。

He is supposed to have written us a letter.

youdao

记住，到那儿之后务必给我们写封信来。

Do remember to write us a letter when you get there.

youdao

我计划给我的女朋友写封信。

I mean to write a letter to my girlfriend.

youdao

我打算给我姑母写封信。

I am going to write a letter to my aunt.

youdao

我必须给我母亲写封信。

I must drop a line to my mother.

youdao

我必须给我母亲写封信。

I must drop a line to my mother.

youdao