Напишите предложение как в 1 примере,о том, что учитель должен делать и что он делать не обязан.
1.study very hard--A teacher has to styde very hard.
2.wear formal clothes at work--
3.care about students--
4.work at weekends--
5.prepare material for stydents--

A teacher has to wear formal clothes at workA teacher has to care about studentsA teacher doesn't have to work at weekendsA teacher has to prepare material for students