In japanese the sentence "what do you like to do?" has the word what succeeded by the particle "o" which marks direct objects, meaning for japaneses "what" is the direct object of this sentence. Is this the same in english? Yes/No - Why?
In a question, the direct object may be the interrogative pronoun what, which, or whom. It cannot be where, how, or when. They are adverbs. Sometimes it helps to keep all the words in the sentence and turn it into a declarative sentence. (English Grammar 101)
- What do you like to do? - You like to do what. (The direct object is what)