condition that)"，引导条件状语从句。

e.g. I will cooperate as / so long as you told me on time.

只要你及时告诉我，我就会合作。

2) as long as 常用来表示："......时间之久 (= during the time that)"，引导时间状语从句。

e.g. You can live here as long as you like.

你可以在这里爱住多久就住多久。

3) as long as还可以表示："既然；因为 (= since)"， 引导原因状语从句。

e.g. As long as you've offered, I accept.

既然你给，我就要。

3. 本单元中采用了新的英文书信格式 (P30)

这种格式是由于现代化办公设备和电脑的广泛使用而逐步形成的。传统的书信格式如下：

letter-writer address

writing-time

address of the addressee

name of the addressee

Dear ...,

The text of the letter...............................................................

..............................................................................................

......................................................

.......................................................................................

..............................................................................................

........................

Yours faithfully,

name of the letter writer

II. 文化背景知识