Rules and Obligation
Complete the sentence: "Tomorrow is Saturday, so I ________ wake up early for school!"
Don't have to (or don't need to).
What is the difference in meaning between mustn't and don't have to?
Mustn't means prohibition (it's forbidden / against the rules); Don't have to means lack of obligation (you can do it if you want, but it's not necessary).
Complete the advice: "If you have a headache, you ________ take a rest and drink water."
Should (or ought to).
Complete: "________ I borrow your red pen for a second, please?"
Can
Scenario: Your friend lost her bus pass and has no money. What modal advice do you give?
*You should borrow some money from someone / You ought to take a taxi.
Which modal expresses an external rule or general law (like wearing a uniform)? (Must or Have to)
Choose the correct option for a library rule: "You ________ talk loudly in the library; people are trying to read."
Mustn't.
What is the main structural difference between should and ought to?
"Ought" is always followed by to (ought to), whereas "should" is followed directly by the base verb without "to".
What modal expresses physical or mental ability in the present?
Can
Scenario: School rules state students are required to wear ID badges. Which modal applies?
You have to wear your ID badge.
Correct the mistake: "She must to finish her history project by Friday."
She must finish her history project... (Remove "to").
Complete: "It's a holiday tomorrow, so you ________ clean your room today if you don't want to."
Don't have to.
Give negative advice for someone who stays up until 3:00 AM playing video games before an exam:
You shouldn't stay up so late. (or You ought not to...)
Complete: "Students ________ use calculators during the math exam; the teacher banned them."
Can't
Scenario: You are at a friend's house and they tell you: "You ________ take off your shoes at the door." (It's optional).
Don't have to (or don't need to).
Complete: "My teacher said we ________ submit the essay before midnight or we will get a zero."
Must (or have to).
Translate this rule into English using a modal: "Está prohibido usar el celular durante el examen."
You mustn't use your cell phone during the exam
Complete the question asking for advice: "________ I talk to my teacher about my low grade?"
Should.
Form a polite request asking permission to leave the classroom:
Can I leave the classroom, please?
Scenario: A teenager is driving 120 km/h in a 60 km/h school zone. What do you tell them?
You mustn't drive that fast! / You must slow down!
Explain the difference in meaning between "I have to study" and "I must study".
"Have to" usually refers to external obligations (rules from outside), while "Must" often comes from the speaker's internal feelings or strong personal conviction.
Is this sentence correct? "You don't have to park here; it says 'No Parking'." Why or why not?
Incorrect. It should be mustn't because parking there is forbidden, not just unnecessary.
Rewrite this sentence using ought to: "It's a good idea for us to study together for the test."
We ought to study together for the test.
Identify the error: "She cans play the guitar very well."
She can play the guitar very well. (Modal verbs never add an '-s' in the third person).
Fix the full sentence: "Yesterday, I must to study until midnight."
Yesterday, I had to study until midnight. (Must doesn't have a past tense form, so we use had to).