MUST
What modal verb expresses strong obligation?
MUST
Does have to express an external rule or advice?
have to/ has to
Which modal expresses prohibition: mustn’t or should?
mustn´t
Does should express advice or prohibition?
Advice
You _____ wear a seatbelt. (Obligation)
must
Complete: You _____ wear a helmet.
You __must___ wear a helmet.
Complete: I _____ wake up early for school.
Complete: I __have to___ wake up early for school.
Complete: You _____ cheat in exams.
Complete: You _mustn´t____ cheat in exams.
Complete: You _____ study more.
Complete: You _should____ study more.
You _____ study if you want good grades. (Advice)
should
Complete: Students _____ arrive on time.
Students __must___ arrive on time.
Complete: She _____ wear a uniform.
Complete: She _has to____ wear a uniform.
Complete: You _____ bring food. It’s optional.
Complete: You _don´t have to____ bring food. It’s optional.
Complete: He _____ apologise.
Complete: He __should___ apologise.
You _____ use your phone during the test. (Prohibition)
mustn´t
What is the structure of must?
A) Subject + must + base verb
B) Subject + must + verb in past
C) Subject + must + to + verb
Subject + must + base verb
A) Subject + have/has to + base verb
B) Subject + have/has + verb in past
C) Subject + have/has + verb with -ing
Subject + have/has to + base verb
What is the difference?
A) Mustn’t = prohibition; don’t have to = no obligation.
B) Mustn’t = advice; don’t have to = prohibition.
C) Both express strong obligation.
A) Mustn’t = prohibition; don’t have to = no obligation.
What is the structure of should?
A) Subject + should + base verb
B) Subject + should + to + verb
C) Subject + should + verb in past
A) Subject + should + base verb
We _____ bring food. It’s optional. (No obligation)
don´t have to