How to block backhand smash and back hand topspin

These shots swing in air this is the reason i can't block these shots please tell me how to block . 

Hi Kritagya,

You need to watch the ball carefully if it goes high.  Then just use the angle of your racket to get the ball back.  You don’t need any forward momentum with your racket.

Take a look at our lesson on the Backhand Block.

However, the real problem is that you have given them a high ball that they can hit hard.  It is important to focus on trying to keep the ball lower so you don’t given them too many easy chances.