You use must not or the short form mustn't / 'mAsnt / to tell people not to do something:
When you want to say that someone can do something if they want, but that it is not necessary, you use don't have to :
hawk / hok /
a large bird that catches and eats other birds and small animals
hay / hei /
dry grass that is used as food for farm animals
hay fe • ver / ' hei fivar /
( health ) an illness like a cold. Grass and other plants can cause hay fever .
haz • ard / ' hrezard /
a danger
► haz • ard • ous / ' hrezardas /
haze / heiz/
air that is difficult to see through because of heat, dust, or smoke ha • zel • nut / ' heizlnAt /
a small nut that you can eat
haz • y / ' heizi /
not clear, especially because of heat
difficult to remember or understand clearly
he © / hi /
head i©/hed/noun
[ count ] the part of your body above your neck
[ count ] your mind or brain
[ singular ] the top, front, or most important part
[ count, noncount ] the person in charge of a group of people or organization
heads [ noncount ] the side of a coin that has the head of a person on it
—ANTONYM tails
a head ; per head
to make you too pleased with yourself
head first
with your head before the rest of your body
keep your head
to stay calm
lose your head
to become too excited, angry, etc.
head 2 / hed /
to move in the direction mentioned
to be the leader or most important person in a group
head • ache / ' hedeik /
( health ) a pain in your head
head • ing / ' hedig /
the words at the top of a piece of writing to show what it is about
head • light / ' hediait /
( also head - lamp / ' hedlremp / )
head • line / hedlain /
[ count ] the words in big letters at the top of a newspaper story
the headlines [ plural ] the most important news on radio or television
head • phones / ' hedfounz /
things that you put over your head and ears so that you can listen to music without other people hearing it
— Look
head • quar • ters / ' hed|kwortsrz /
the main offices where the leaders of an organization work
head • set / ' hedset /