Use the verb sit when the person or object is doing the action.
I can sit in this chair.
The baby will sit in the crib.
My cat can sit on the windowsill.
Use the verb set when an object is being placed by someone else.
Mom set the bowl on the table.
Dad set the timer on the oven.
Did you set the box on the floor?
Use the verb sit with the noun is doing the action. Use the verb set when an object is being placed by someone else.
▶It’s your turn. Decide if you should use sit or set in this sentence. Mom asked me to _____ plates on the table. Did you figure it out? Good for you.