Students needn't eat lunch at school. Students needn't go to the playground for assembly. Students needn't 'wai' teachers. Students needn't do hard homework. Students needn't drink milk in the morning.
Students can go outside of the school at lunchtime.
Students can play games in the classroom. Students can listen to the radio in the classroom. Students can play in the playground until 6.30 p.m. Students can play with the teachers. Students can sleep in the classroom. Students can come to school late.