In English grammar, we usually make mistakes when using verb tenses in writing, especially when talking about someone's whereabouts. Always remember that whenever you ask someone a question about something they are doing now or something that is happening today, use the present tense. If you're asking about something in the past, use did followed by the base form of the verb. There should only be one verb in the past tense. If there is did, there is no need to use the past tense of the main verb.
It's okay to make mistakes cause we not perfect, but let's hit the books and keep doing harder as part of the learning progress!