Module code: 200
Understanding 'Have to' vs 'Must': Obligation and Choice
1 Introduction
In English, we use both have to and must to talk about things we need to do. Sometimes they mean the same thing, but sometimes they are different. Let’s learn when to use each one correctly.
Key Terms
- have to
- need to do something because of a rule or situation
- must
- need to do something (can be a rule or personal choice)
💬 Section 1: No Choice Situation
At school after classes
Tom: “I have to go home now.”
Sarah: “Why do you have to leave so early?”
Tom: “My mom called. She needs help with shopping.”
Sarah: “Do you have to go shopping every week?”
Tom: “Yes, I have to help on Thursdays.”
Sarah: “That's nice. Does your brother have to help too?”
Tom: “No, he doesn't have to help. He has football practice.”
2 Have to Overview
We use have to when someone else makes the rule or when we can’t choose. For example: ‘I have to wear a uniform at school.’ The school makes this rule.
Key Terms
- uniform
- special clothes you wear at school or work
💬 Section 2: Personal Choice
At home discussing a book
Sarah: “I must finish this book today!”
Tom: “Must you? Is it homework?”
Sarah: “No, I just really want to know the ending!”
Tom: “What's so special about this book?”
Sarah: “It's amazing! You must read it too!”
Tom: “Is it a long book?”
Sarah: “No, but you must start it this weekend!”
3 Must Overview
We use must in two ways: for rules (like signs or formal writing) and for things we really want to do. For example: ‘I must call my friend’ can mean you want to or need to.
Key Terms
- rules
- instructions that tell us what we can and can't do
4 Lexical Contrast & Nuance
When we say ‘I have to‘, it always means we don’t have a choice. When we say ‘I must‘, it can mean we want to do it or we need to do it.
Key Terms
- choice
- when you can decide what to do
📝 Key Vocabulary Recap
◆ have to→need to do something because of a rule or situation
◆ must→need to do something (can be a rule or personal choice)
◆ don't have to→not necessary to do something
◆ doesn't have to→not necessary for someone else to do something
◆ want to→desire to do something
◆ need to→something that is necessary
◆ obligation→something you must do
◆ choice→when you can decide what to do
◆ uniform→special clothes you wear at school or work
◆ rules→instructions that tell us what we can and can't do
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