1) I’m so tired because I have been
cleaning my room all morning.
2) You have been waiting for me for more than two hours.
3) He has been studying English since he was 8 years old.
4) She has been sleeping since 5 p.m.
5) We are dirty because we have been working in the garden.
6) You have been playing computer for 2 hours.
7) They are out of breath because they have been running after a bus.
8) I have been thinking about it for many years.
9) There is a mess because workmen have been installing some new equipment all
day.
10) I’m so tired because I haven’t been sleeping all night.