Birthday~

I remember 1 of year birthday.
My friends them are look like so busy,
while usually they are not like that.
They will spend much time chat in class also don't want do work.
But that day so weird, they are so busy.

Siau boon: I

My friends: B

So I ask them:" What are you all doing?"

1 of my friends answer:"Do work." I: So rush? B: Yes. I: Today got work have to pass up? Why I don't know! B: No work want to pass up today.

I felt so weird and also don't know want to ask what.
In the end, they gave me a Birthday card with their own greeting.

During I asked, my friend them were answer in Over- Generality.
Although I understand what their words answer,
but actually i couldn't get what their exact meaning!