Expression: How come you did not come to class yesterday?

[Sonia*]

Hello! Alan.

Hope you are fine and doing well!

Please tell me the exact meaning of the following expressions which I came across while reading a dialogue book.

1. How come you did not come to class yesterday?
2. What have you been up to?

Please tell me what answer we expect from the listener by asking these two expressions.

Thanks a million Alan!

Sonia*

[Milanya]

How come = why?
to be up to = Up To ( what you have been doing ... )
_________________
con·text - The part of a text or statement that surrounds a particular word or passage and determines its meaning.

[Sonia*]

[Milanya]

[quote="Sonia*"]

[Sonia*]

Hi! Milanya.

Your guidence is very helpful for me. I do appreciate your input.

Thanks a lot!

Sonia*