Before/After/When I'm hungry, I make myself a sandwich.
When
I study before/after/when I take a test.
before
You have to brush your teeth before/after/when eating
after
What do you do before you go to school?
...
What do you do when you get home?
...
I like to drink milk before/after/when I go to sleep.
before
Before/After/When we go surfing, we take a shower.
Before
I met her before/after/when I was shopping.
when
Before/After/When I work out, I have a shower.
After
What do you do after dinner?
...
