唔該幫手諗理由!!

上堂...
1定要
pay attention
raise question if u dont understand
be active in any discussion or sharing section

一定唔可以
keep talking
make fun on teachers

平時
must:
keep the classroom clean
wisely use the electrical appliances according to teachers' instructions

mustnt:
fighting
smoking
drawing on desk (smear anything in the classroom)
turn on unnecessary electrical appliances