1) I (learn) French for ten years. 2) If I (stay) some more days in your town, I (call) on you. 3) While he (ring) me up yesterday, I (help) mother. 4) Mary (buy) a new hat. 5) He (write) a letter for three hours when I came. 6) I want to know whether he (see) Olga.
1. I have been learning
2. If I stay, I will call
3. Rang, was helping
4. Bought
5. Had been writing
6. Saw