GRAMMAR
must/mustn't; mustn't vs don't have to
1 Complete the sentences from the reviews. Then
complete the rule with must, mustn't or don't have to.
1 You
do anything. Sunny Star does all
the work for you.
2 You
switch Travel Plus off at night.
3 You
tell your teachers.
Use 2
Use 3
RULE: Use? to say it's necessary to do it.
to say "it's not necessary!
to say 'don't do it! I'm telling you not to!​

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