Chapter 2 Must _ mustn’t Rules and signs语法 课件(共21张PPT)

(共21张PPT)
Primary Longman Elect
2A Chapter 2
Must / mustn’t
Rules and signs
Keep quiet in the library.
You must keep quiet in the library.
Wait for your turn in the computer room.
You must wait for your turn in the computer room.
Must / mustn’t
We use ‘must’ or ‘mustn’t’ to tell people what they have to / don’t do.
We sometimes use ‘must’ or ‘mustn’t’ in school rules.
e.g. You must keep quiet in the library
You have to keep quiet in the library.
e.g. You mustn’t eat or drink in the library.
You cannot eat or drink in the library.
Must / mustn’t
You must line up in the corridor.
Must / mustn’t
You must sit still.
Must / mustn’t
You must keep off the grass.
Must / mustn’t
You mustn’t climb the trees.
You
must
mustn’t
keep quiet.
spit.
must not
Sit still
Wait for your turn
in the
hall.
computer room.
Key structure
Rules
We can usually see rules on signs in schools.
Some signs tell us we mustn’t do something. We use words ‘No’ and ‘Don’t’.
We always add ‘-ing’ to the action word when we use ‘No’.
Rules
You mustn’t climb the trees.
No climbing.
Don’t climb the trees.
You mustn’t litter.
No littering.
Don’t litter.
Rules
Practice
Don’t pick the flowers.
You mustn’t pick the flowers.
Rewrite the rule. Use must or mustn’t.
Practice
Rewrite the rule. Use must or mustn’t.
Wait for your turn.
You must wait for your turn in the computer room.
Practice
Rewrite the rule. Use must or mustn’t.
You mustn’t spit.
Practice
Write the sings using No or Don’t.
No littering. / Don’t litter.
You mustn’t litter.
Practice
Write the sings using No or Don’t.
Don’t pick the flowers.
You mustn’t pick the flowers.
You must line up in the corridor.
You mustn’t spit onto the floor.
In the computer room, you must wait your turn.
You must sit still and keep quiet if you want to learn.
Rhyme Time
The End