Conjunction used to make similar points:
and, but, or, so
AND
Is the following sentence correct?:
Lucy was thirsty, so she drank some water.
Correct
Miggy is nice ____ smart.
and, but, or, so
and
The pizza smells good. The pizza tastes delicious.
The pizza smells good and tastes delicious.
Conjunction used to show contrast / express exceptions:
and, but, or, so
BUT
Is the following sentence correct?:
My favorite colors are blue but green.
Incorrect
You can eat your cake with a spoon ___ you can use a fork.
and, but, or, so
or
Conjunction used to choose between different options: and, but, or, so
OR
Is the following sentence correct?:
Do you want to eat a ham sandwich or a tuna sandwich?
correct
I finished my dinner, ____ I was still hungry.
and, but, or, so
but
Conjunction used to show the result of something:
and, but, or, so
SO
Is the following sentence correct?:
Tom studied a lot, so he didn't pass the test.
Incorrect
I left school early, _____ I could go to my dentist appointment.
and, but, or, so
SO