Question

Count Olaf can do a cartwheel as long as he stretches
his legs first.
Do i add a comma?

Answer 1

Answer: Yes or No

Explanation: If you are using "Count Olaf can do a cartwheel" as an introductory clause then you would use a comma.

However, if you are not using it as an introductory clause, you have not used a coordinating conjunction therefore the answer would be no.