Odpowiedź:
1. Tina was late for school beacause there was a traffick jam
2. By the time we Got to the class, the lesson already started
3. They become best friends after they met at lunch
4. When I arrived at the theater the play has already started
5. When I started doing my homework it started to rain
6. I couldn't borrow a book from the school library as I forgot what book I needed
