MENGEKSPRESIKAN TIDAK ADANYA KEHARUSAN: DO NOT HAVE TO MENGEKSPRESIKAN LARANGAN: MUST NOT

    

(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.	Don’t/doesn’t have to express the idea that something is not necessary.
(c)    Children, you must not play with matches! (d)   We must not use that door. The sign says: PRIVATE: DO NOT ENTER.	Must not express prohibition. (DO NOT DO THIS!)
(e)    You mustn’t play with matches.	Must + not = mustn’t (Note: The first “t” is not pronounced.)