Open the brackets.
1. They (to translate) _______________ this article since morning and (not/to finish) ______________ yet

2. Jane (to teach) _____________________________ at this university since September.

3. I (to work) ___________________________________________ at my report since Monday. Now I (to write) ______________________________ the conclusion.

4. Justine (to try) ___________________________________________________ to open this box for the last 20 minutes.