Answer:
1. Before they (started) the party, they (invited) some friends.
2. Jill (phoned) Dad at work before she (left) for her trip.
3. My sister (ate) all the chocolate before my parents (came) home.
4. Susan (turned on) the radio after she (washed) the dishes.
5. When she (arrived) the match already (started).
6. After Eric (made) breakfast he (phoned) his friend.
7. After the man (came) home he (fed) the cat.
8. Before he (sang) a song he (played) the guitar.
9. She (watched) a video after the children (went) to bed.
10. My sister (ate) all the chocolate before my parents (came) home.
11. They (rode) their bikes before they (met) their friends.
12. After Fred (spent) his holiday in Italy he (wanted) to learn Italian.
Step-by-step explanation: