Modals of NECESSITY

Need (verb) (without to) is used in negative and interrogative sentences. Also, we can use don`t have to / doesn`t have to / didn`t have to(past), must for the same purpose. In the affirmative, we use need to to express necessity. Modals of necessity example sentences;

• He mustn’t be late for the meeting.
• I must be careful not to upset her.
• They must leave immediately.
• You don’t have to give me money but I can if you want.
• You need to do the exercises, they are obligatory.
• You had to try hard for the match.
• I must study next week.