Present Perfect Progressive Tense

Tense : Present Perfect Progressive Tense 现在完成进行式

Formula : verb to have + been + present participle
                  Ex: have/ has been doing
                        have/ has been writing

Usage :

-An action which has been happening for a period of time and still continues happening

 
一个从刚才到现在还在持续发生着的一个动作，截至使用这个tense时尚未完成那个动作

Examples :
a) -I have been eating pizza since 3 o’clock.
我从三点钟开始吃批萨（到现在我还一直吃，而且还未停，还不知道会吃到几点）

b)-He has been listening to music for five hours.

Keywords : -since
                     -for

Exercise :
Put in the verbs in the Present Perfect Progressive and form negative sentences.
Example: Stella _________________ tennis for half an hour now. (not/to play)

Answer: Stella has not been playing tennis for half an hour now. or Stella hasn't been playing tennis for half an hour now.

1) Carl _____________________ to the teacher for the last ten minutes. (not/to listen)

2) The students _____________________ to learn the new words. (not/to try)

3) Kim __________________________ crossword puzzles. (not/to do)

4) The teachers _________________________ in the sun. (not/to lie)

5) I _____________________________ in the last lesson. (not/to sleep)