1. It’s a good idea for you to wear a cardigan if it is cold.
You should wear a cardigan if it is cold
2. It isn’t a good idea to go to bed late every night.
You should not go to bed late every night
3. It’s good for you to eat some fruit or vegetables every day.
You should eat some fruit or vegetables every day
4. It’s necessary to wear uniform at school.
You must wear uniform at school
5. It’s necessary to listen to teacher.
You must listen to the teacher