1 I haven't seen him 2 Maria hasn't played tennis since refers to a fixed point in time 3 Bob and I have been friends 4 ages. last summer. years. his birthday, Lars has been behaving rather strangely. for refers to a period of 5 Mr Brown worked in New York time and can be used 6 They waited outside the cinema ten weeks. half an hour. with different tenses. 7 Peter has been in this country. 8 We lived in Paris January 27th 2005. a long time before moving to Brussels. 9 I've been waiting for the doctor 10 I'm sorry I haven't written 4.30. so long. three people