have (one's) mind on other things
To be distracted or unable to focus. Could you repeat that? I'm sorry, I just have my mind on other things right now.
have your ˌmind on other ˈthings
, your ˌmind is on other ˈthings
not give somebody/something your full attention because you are thinking about something else: ‘He’s made a few mistakes today. What’s the matter with him?’ ‘He’s got his mind on other things. Family problems mainly.’