仓促地写完一封信；匆忙地喝下一瓶果汁。

Dash off a letter; dash down a glass of juice.

youdao

我只差一封信就全写完了。

I have written all my letters but one.

youdao

昨晚我给父母亲写了一封信。(已经写完了。)

I was writing a letter to my parents last night, when the fire broke out.

youdao

昨晚我在写一封信。(信可能没有写完)。

I was writing a letter last night.

youdao

昨晚我在写一封信。(信可能没有写完)。

I was writing a letter last night.

youdao