C. The first in a series of verbal expressions does not take le. The second verb takes a sentence-end leif the action is completed. If the object of the second verb is quantified or modified, the second verb takes the verb-suffix le.

 

3.1     Shàng ge xīngqī-tiān (x) shūdiàn mai-le běn Hàn-Yīng zìdiǎn. 

上个星期天我去书店买了一本汉英字典。

Last Sunday, I went to the bookstore and bought a Chinese-English dictionary.

 

3.2     yǐjīng (x) diànhuà gàosù(x) zhèi jiàn shì le. 

          我已经打电话告诉他这件事了。

I have already called him to tell him about this matter.