Explain the following facts. The word combinations from the box will help you. Use the present perfect continuous or the present perfect. work on orbital stations several times

1. He has been watching TV since the morning.
(Он смотрит телевизор в утра)
2. He has discovered a new star.
(Он открыл новую звезду)
3. We have been doing research into space for many years already.
(Мы проводим исследования в космосе уже многие годы)
4. He has worked on orbital stations several times.
(Он работал на орбитальных станциях несколько раз)