The document provides examples of using the words "must" and "mustn't" in sentences. It shows situations where actions are required using "must" and situations where actions are prohibited using "mustn't". Some examples include students must listen to their teacher in class, Cinderella must try on the shoe, people must fasten their seatbelt while driving, and swimmers must wear rubber rings if they can't swim.

2. They’re in
class, they
____ listen
to their
teacher.
MUST
Cinderella,you
___ try this
shoe. MUSTN’T
MUST
They’re in class,
they MUST
listen to their
teacher.
Cinderella,you
MUST try
this shoe.
MUSTN’T

3. They____ stay
too long in the
bath, the
water’s going to
cool down.
MUSTN’T MUSTN’T
MUST
They MUSTN’T
stay too long in
the bath, the
water’s going to
cool down.
He can’t sing, so
he MUST take
a course.
.
MUST He can’t sing,
so he ___ take
a course.

4. They’re super
heroes, they
____ save
the world.
MUST He ___ have a
shower before
going to bed. MUSTN’T
MUST
They’re super
heroes, they
MUST save the
world.
He MUST have
a shower before
going to bed.
MUSTN’T

5. They____
recycle to
protect the
Earth.
MUST He’s going to
school, he ___
be late.
MUST
MUSTN’T
They MUST
recycle to protect
the Earth.
He’s going to
school, he
MUSTN’T
be late.
.
MUSTN’T

6. She’s driving,
she _____
fasten her
seatbelt.
MUST They can’t
swim, they ___
wear their
rubber ring. MUSTN’T
MUST
She’s driving, she
MUST fasten
her seatbelt.
They can’t swim,
they MUST
wear their rubber
ring.
.
MUSTN’T

7. She’s driving,
she _____
fasten her
seatbelt.
MUST They can’t
swim, they ___
wear their
rubber ring. MUSTN’T
MUST
She’s driving, she
MUST fasten
her seatbelt.
They can’t swim,
they MUST
wear their rubber
ring.
.
MUSTN’T