Воткните at,of,in or on. Of course, were not very good ...

Of course, were not very good at it yet, and at first we were really bad at it.

To be good at something.

To be bad at something.

My friend is good at drawing.

He is bad at singing.

Mary is good at dancing, but she is bad at playing the piano.

This horse is good at running, but he is bad at jumping.

This boy is good at History, but he is bad at Geography.

I am good at Russian, but I am bad at Italian.

Tom is good at Maths, but he is bad at Literature.