1. I'll wait until he (finish) his novel. 2. When you (came) back, he already (buy) a new house. 3. Don't come until I (finish) lunch. 4. I (hope) it (stop) raining by 5 o'clock this afternoon. 5. The river (not begin) to swell until some rain (fall).

1. I'll wait until he (finish) finishes his novel.
2. When you (came) come  back, he has already (buy) bought a new house.
3. Don't come until I (finish) have finished lunch.
4. I (hope) hope it (stop) will have stopped raining by 5 o'clock this afternoon.
5. The river (not begin) will not begin to swell until some rain (fall) falls .