Welcome to our comprehensive guide on Modals of Ability and Obligation! In this interactive grammar lab, we will learn how to express what we can do, what we must do, and what we should do.
We will explore helper verbs like can, must, and should, learn how to avoid the dangerous "Obligation Trap" (mixing up mustn't and don't have to), and practice matching meanings. Scroll down to explore the flashcards, test your knowledge, and complete today's missions.
Ability & Obligation
Modal verbs are helper verbs that change the mood of your sentence. Today, we will learn how to express what you can do, what you must do, and what you should do.
warning The Negative Trap!
In the positive form, "Must" and "Have to" mean almost the same thing. But in the negative form, they are completely different! This is the most common mistake English learners make.
"You mustn't do that."Meaning: Do NOT do it. It is strictly forbidden.
"You don't have to do that."Meaning: It is not necessary. You have a choice.
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1. Modal Explorer
Filter the rules below and click on any card to reveal its definition and example.
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2. Match the Meaning
Click the cards to see which Modal verb matches the meaning.
You are forbidden!Meaning
It is not necessary.Meaning
It is a good idea.Meaning
I have the skill.Meaning
It is an external rule.Meaning
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3. Knowledge Check
history Past Ability
"When I was a child, I ___ run very fast."
gavel External Rule
"You ___ wear a uniform to work at this company."
warning COMMON TRAP
"Tomorrow is Sunday, so I ___ wake up early."
lightbulb Giving Advice
"You look very tired. You ___ go to bed."
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Quiz Complete!
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4. Action Missions
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5. Frequently Asked Questions
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What is the difference between "Must" and "Have to"?
Often they are interchangeable. However, Must is usually internal (I must study because I want to pass). Have to is external (I have to wear a uniform because my boss says so).
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Can I use "Can" in the future tense?
No! "Can" only has present and past (could) forms. To talk about an ability in the future, you must use "will be able to" (e.g., I will be able to drive next year).
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What is the difference between "Should" and "Ought to"?
They mean exactly the same thing (giving advice). However, "Should" is much more common in everyday English. "Ought to" sounds a bit more formal or old-fashioned.
