Ответ:
Временные союзы выбираются по смыслу: before — «до того как», when — «когда», then — «затем», after — «после того как».
- I have my breakfast before I brush my teeth.
- I get up when my alarm clock rings.
- On Saturdays we have lunch and then we go shopping.
- He watches a film on TV; after he goes to bed.
- They always leave out food for the cat before they leave the house.
