007_index

Modal Verbs Usage

Nakib Noor6 min read

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english hum-1109 Hum-1109 Technical English

Category 1: Logical Deduction & Inference (High Importance)

This is the #1 most frequently asked category. It means making a strong guess based on evidence.

1. Must (Logical Deduction)

  • Rule: Used when you are almost 100% sure about something based on evidence.
  • Source Examples:
    • Present: You look tired. You must work hard.
    • Past: You looked tired. You must have worked hard.
  • PYQ Practice:
    • (2024, 2023, 2021, 2019, 2015): Make a sentence using Must (Logical deduction).
      • Ans: She has a big house; she must be rich.
    • (2022): Must (Logical deduction in the past).
      • Ans: He must have finished his work yesterday.

2. Could (Inference)

  • Rule: Used to make a guess based on evidence (similar to “might be”).
  • Source Examples: Someone is knocking at the door. It could be Jill.
  • PYQ Practice:
    • (2024 CSE, 2023, 2022): Make a sentence using Could (To express inference).
      • Ans: It could be true. / He could be at home now.

Category 2: Possibility & Uncertainty

Used when you are not sure.

1. May (Guess/Uncertainty/Probability)

  • Rule: Expresses a good chance (approx 50%) of something happening.
  • Source Examples:
    • Future: He may come tomorrow. / It may rain tonight.
    • Present: It may be raining in Khulna now.
    • Past: It may have rained last night.
  • PYQ Practice:
    • (2024, 2024 CSE, 2023): May (Guess about the present).
      • Ans: He may be at home right now.
    • (2022, 2018, 2017): May (Guess about the future).
      • Ans: It may rain tomorrow.
    • (2020): May (To express uncertainty).
      • Ans: She may not come to the party.

2. Might (Remote Possibility)

  • Rule: Less likely than ‘May’ (approx 20-30%).
  • Source Examples: I thought he might be at home.
  • PYQ Practice:
    • (2018, 2015): Might (To express uncertainty).
      • Ans: It might rain this evening.

3. Be Going To (Strong Possibility)

  • Rule: Used when there is physical evidence that something is about to happen.
  • Source Examples: The sky is cloudy. It is going to rain.
  • PYQ Practice:
    • (2020, 2017): Be going to (Strong possibility).
      • Ans: Look at those clouds! It is going to rain.

Category 3: Obligation, Duty & Advice

1. Should (Duty/Advisability)

  • Rule: Used to say what is the right thing to do.
  • Source Examples:
    • Present: You should be working now.
    • Past: You should have worked hard.
  • PYQ Practice:
    • (2024, 2023, 2022): Should (Duty in the past).
      • Ans: You should have helped her when she needed it.

2. Ought to (Moral Duty)

  • Rule: Similar to ‘Should’ but stronger on moral grounds.
  • Source Examples: You ought to love your motherland.
  • PYQ Practice:
    • (2020): Ought to (To express duty).
      • Ans: We ought to help the poor.

3. Had Better (Advice/Duty/Preference)

  • Rule: Used for strong advice or “present duty” in a specific situation. It implies a warning.
  • Source Examples: You are ill. You had better see a doctor.
  • PYQ Practice:
    • (2024, 2024 CSE, 2019): Had better (Advisability/Preference).
      • Ans: You had better study hard.
    • (2015): Had better (Present duty).
      • Ans: You had better go home now.

4. Need (Necessity & Unnecessary Action)

  • Rule: Usually asked in the negative to show something wasn’t necessary.
  • Source Examples:
    • Present: You need not go there.
    • Past: You need not have gone there. (You went, but it wasn’t needed).
  • PYQ Practice:
    • (2024, 2023, 2022): Need (Unnecessary action in the past).
      • Ans: You need not have worried about the exam results.

Category 4: Ability & Past Opportunities

1. Could (Past Ability)

  • Rule: General ability in the past.
  • Source Examples: Andre Agassi was a good player. He could beat anybody.
  • PYQ Practice:
    • (2017, 2015): Could (Past ability).
      • Ans: I could swim across the river when I was young.

2. Could Have (Unfulfilled Past Opportunity)

  • Rule: Something was possible in the past, but it didn’t happen.
  • Source Examples: The party was enjoyable. You could have joined the party.
  • PYQ Practice:
    • (2024, 2018, 2017): Could (Opportunity in the past which was not executed).
      • Ans: I could have won the match if I had practiced more.

Category 5: Intentions, Arrangements & Commands

1. Be to (Arrangement/Command)

  • Rule: Used for official plans or strict orders.
  • Source Examples:
    • Arrangement: He is to go to Dhaka tomorrow.
    • Command: You are to leave the room at once.
  • PYQ Practice:
    • (2024 CSE, 2019, 2015): Be to (Arrangement/Order/Command).
      • Ans: You are to report immediately.

2. Be Going To (Intention)

  • Rule: A plan you have already made.
  • Source Examples: He is going to marry next month.
  • PYQ Practice:
    • (2022, 2019): Be going to (Intention/Plan).
      • Ans: I am going to visit my grandmother next week.

Category 6: Habits & Miscellaneous

1. Would (Past Habit)

  • Rule: Used for “irregular” past habits (things you used to do often but not constantly).
  • Source Examples: He would go on a long bike ride.
  • PYQ Practice:
    • (2021, 2018, 2015): Would (Past irregular habit).
      • Ans: My grandfather would tell us stories every night.

2. Would Rather (Preference)

  • Rule: Used to choose one thing over another.
  • Source Examples: I would rather go by car.
  • PYQ Practice:
    • (2021): Would rather (Preference).
      • Ans: I would rather stay home than go to the mall.

3. Dare (Indulgence/Challenge)

  • Rule: Often used in negative or interrogative.
  • Source Examples: How dare you insult me?
  • PYQ Practice:
    • (2022, 2015): Dare (Indulgence/Perseverance).
      • Ans: How dare you speak to me in that tone!

Expert Comments & Study Strategy

  1. The “Past Unfulfilled” Trap:

    • Be very careful with questions asking for “Unnecessary action in the past” (Need) or “Opportunity in the past not executed” (Could).
    • You MUST use the perfect tense structure: Modal + Have + V3.
    • Wrong: You need not worry yesterday.
    • Correct: You need not have worried yesterday.

  2. Deduction vs. Duty:

    • If the question asks for Logical Deduction, use MUST. (e.g., He has a Ferrari; he must be rich.)
    • If it asks for Duty, use SHOULD or OUGHT TO. (e.g., You should help him.)

  3. Command vs. Order:

    • If asked for Command, use Be to (e.g., You are to leave).
    • If asked for Order (and “Be to” isn’t specified), you can also use Must (e.g., You must leave), but Be to is the safer, more technical answer found in Munshi Sir’s slides.

Final Plan: Memorize the example sentences in “Source Examples” above. The exam questions often repeat these exact scenarios (e.g., the “Andre Agassi” tennis example for Could, or the “Clouds” example for May/Be going to).

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