Have to vs must

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Have to vs must

  1. 1. MUST vs. HAVE TO
  2. 2. Can you feel the difference? <ul><li>I have to arrive at 9 sharp. My boss is very strict. </li></ul><ul><li>I must go to bed earlier. I want to get enough sleep </li></ul>
  3. 3. Can you see the difference? <ul><li>That has to be Amy. I think I’ve seen her before. </li></ul><ul><li>That must be Amy. They said she is tall with long hair. </li></ul>
  4. 4. How about these two? <ul><li>You don’t have to eat it. </li></ul><ul><li>You mustn’t eat it. </li></ul>
  5. 5. Meaning 1: Strong obligation <ul><li>I have to arrive at 9 sharp. My boss is very strict. </li></ul><ul><li>You have to meet the deadline. Otherwise you’ll not be able to participate. </li></ul>some external circumstance makes the obligation necessary <ul><li>I must go to bed earlier. I want to get enough sleep. </li></ul><ul><li>You must take the pills. You’ve been sick for over a week. </li></ul>some personal circumstance makes the obligation necessary
  6. 6. Meaning 2: Certainty Subtle difference <ul><li>That has to (has got to) be Amy. I think I’ve seen her before </li></ul><ul><li>That must be Amy. They said she is tall with long hair. </li></ul><ul><li>You have got to be kidding. </li></ul><ul><li>You must be kidding </li></ul>
  7. 7. Negative forms <ul><li>You don’t have to eat it. (it’s optional. You have a choice) </li></ul><ul><li>You mustn’t eat it. (it’s obligatory, prohibited in this case. You have no choice) </li></ul>
  8. 8. Have to Have got to Gotta <ul><li>You gotta try this cake. It’s delicious. (certainty) </li></ul><ul><li>I gotta go. I have a doctor’s appointment. (external circumstance) </li></ul><ul><li>She’s gotta do it now. The deadline is today. </li></ul>

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