The difference between Be up to and Get up to
When used as verbs, be up to means to do or be involved in doing, whereas get up to means to do something, especially something that is forbidden or improper.
check bellow for the other definitions of Be up to and Get up to
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Be up to as a verb (idiom):
To do or be involved in doing; to do (often something mischievous or inappropriate).
Examples:
"I saw you hiding in the bushes yesterday. What were you up to?"
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Get up to as a verb:
To do something, especially something that is forbidden or improper.
Examples:
"Recently he's been getting up to all sorts of mischief."
"I haven't seen you for a while. What have you been getting up to?"