Japanese 241 - Verb + の + ability

One thing this allows us to do, is to express that we are good at or bad at a certain activity. To say that we're good at something, we simply use a verb in the plain form + のがじょう. Similarly, if you' don’t like're not good at something, you can use plain form + のが.

We already knew how to say he is good at Japanese. Now we're also able to say he is good at speaking Japanese.