Step-by-step explanation:
A) Amy teaches Science at a high school, but now she is not teaching Science at school now. She is at home. She is teaching her daughter how to cook.
B) Tony is a chef in a very nice restaurant. He cooks delicious food for his customers. He is not cooking now. He is relaxing at home and watching a game on TV.
C) Tom is a garbage collector. He works hard to keep the city clean. Right now, he is not collecting garbage. He is shopping.