Meaning representation: request_explanation(release_year[1999], rating[good], platforms[Xbox])
Utterance: Why do you think 1999 was a good year for the Xbox?
Utterance: Why do you think that the games released on the Xbox in 1999 were pretty good?
Utterance: What would you say is the main reason for the Xbox games from 1999 to be as good as they were?