sorry..I am lazy to write in chinese..
first..what is the meaning of''以茲證明''?
Can I say that my mum's words are 證明?
actually..I have signed in the notice to join an activity at school
however,I have forgotten to go to the activity..
the next day, the teacher said that I should hand in a 家長信 to explain why i haven't join
and 證明 that I am at home but not another place...
can you guys help me..
thx...