15. As I was walking home, it begin to rain.
begin ⇒ began
16. We stayed there after we finished our work.
finished ⇒ finish
17. Once it will stop raining, we will leave.
stop ⇒ stops
18. I will never speak to him again as long as I will live.
will live ⇒ live
19. As soon as the other passengers gets on the bus, we’ll leave.
gets ⇒ get
20. As soon as I will finish my report, I’ll call you and we’ll go out to dinner.
As soon as ⇒ Whenever
21. Mark was listening to music after his sister was reading a book.
after ⇒ while
22. Sam hadn’t received the parcel when I speak to him.
speak ⇒ spoke
23. I have been hoping to meet you before I read your first novel.
to meet ⇒ to see
24. By the time you finishes getting ready, we will have missed the train.
finishes ⇒ have finished
25. When you will arrive, there will be someone to meet.
you will ⇒ you