Recently, I know the Word "get up to". It just means "do something." But I still don't understand the difference between "be up to" and "get up to".
For example, When I want to ask what you did yesterday, I say
What were you up to yesterday? =What did you get up to yesterday?
When I want to ask what you're doing right now, I say
What are you up to now? =What are you getting up to now?
When I haven't seen you for a long time and ask what you have been doing recently, I say
What have you been up to? =What have you been getting up to?
When I want to ask what you're gonna do tomorrow, I say
What are you up to tomorrow? =What do you get up to tomorrow?
Am I right? Thank you for your help.