You are quite close, really. While you can say NOUN + ga suki da or NOUN + ga kirai da, if you would like to use a verb, you must first change it into a nominal phrase. This is generally accomplished by adding a "no" or "koto" at the end of the verb. For example: Watasha ha ge-mu wo asobu NO/KOTO ga suki desu. わたしはゲームをあそぶのがすきです。 Watashi ha nohongo wo benkyou suru NO/KOTO ga suki desu. わたしはにほんごをべんきょうすることがすきです。 Hope this helps!

Nihongo no benkyou ga suki. Nihongo wo benkyou suru no ga suki.

Watashi ha geemu o asobu ga suki desu. →Watashi wa geemu de asobu noga suki desu. or Watashi wa geemu ga suki desu. You don't have to say "asobu",because games are asobi, But you better say　Watashi wa (TV,PC,sport・・・etc.)geemu ga suki desu. Watashi ha benkyou o nihongo ga suki desu. →　Watashi wa nihongo no benkyou ga suki desu. Watashi wa nihongo wo benkyou surukoto ga suki desu. When someone ask you"Nani ga suki desuka?" Then, you can say"Nihongo no benkyou ga suki desu."(natural) "Nihongo wo benkyou surukoto ga sukidesu"(sound like foreigners saying) No need to say "Watashi wa"

Hola, ya te respondieron y quisiera añadir unas cocitas. Sería más natural decir "geemu de asobu" or "geemu wo suru". También puedes decir "nihongo no benkyou ga sukidesu". (Nihongo wo benkyou suru koto= verbo + koto, nihongo no benkyou = noun) Espero que te ayude.