Forehand backspin serve/no spin serve

I had some difficulties whether a forehand serve is backspin or no spin serve.Please help!

Hi Jeremy,

Ou need to watch the contact and the flight of the ball.  These will give you clues.  If they contact the ball flat then there will be no spin.  If the contact is a brushing action under the ball then it will be backspin.

The flight is also a bit different.  The spin serve will go slower through the air.