F. Le is used for asking and answering questions about how long one has not done something or, in other words, time elapsed since one last did something.

 

 

Sentence Pattern: subject + (adverb) + duration + méi(or méi yǒu没有) + verb + (object) + le

 

It is important to note that this pattern places the duration before the verb and uses méi and le in the same sentence.

 

6.1     yǐjīng liǎng tiān méi(yǒu) chī fàn le.  

我已经两天没吃饭了。

I have not eaten for two days.

 

6.2     yǐjīng sān nián méi xué Zhōngwén le.  

他已经三年没学中文了。

He has not studied Chinese for three years.