You should study _______ your exam.
before
Put your socks on _______ you put on your shoes.
before
We should go shopping _______ it starts raining.
before
Lock the door _______ you leave.
before
You might want to wait until _______ work is finished to watch YouTube.
after
Telephones were invented _______ the internet.
before
The internet was created _______ computers.
after
I alway feel sleepy _______ I wake up.
when / after
I often have dreams _______ I am asleep.
when
You shouldn't talk _______ you are taking a test.
when
Suitcases with wheels were invented _______ airplanes.
after
