Learning Objective: This is a grammar class. At the end of the session, the participants are expected to understand the difference between do not have to and must not.
Do not have to... and Must not...


Learning Objective: At the end of the session, the students are expected to be able practice in conversation the expressions used for lack of necessity and prohibition.

Expressing lack of necessity: Do not have to...

Examples:

a. I finished all of my homework this afternoon.

I don't have to study tonight.

b. Tomorrow is a holiday.

Mary doesn't have to go to class.

EXPLANATION:

Don't / doesn't have to expresses the idea that something is not necessary.

Expressing prohibition: Must not...

Examples:

c. Children, you must not play with matches!

d. We must not use that door. The sign says: PRIVATE: DO NOT ENTER.

EXPLANATION:

Must not expresses prohibition. (DO NOT DO THIS!)

e. You mustn't play with matches.

Must not = mustn't.

Note: the first "t" is not pronounced.

EXERCISE PROPER