Key Difference

• “Should” is used to suggest advice or recommendations without implying strong obligation. It’s like giving friendly guidance.
• “Must” implies a strong necessity, almost like a rule or something that’s required.

Think of “should” as a gentle nudge, while “must” is more like a firm instruction.

Detailed Breakdown

1. Should – Friendly Advice or Recommendation

When you use “should”, you’re giving advice, but it’s not something the person absolutely has to follow. It’s a way to gently encourage or suggest a course of action.

• Examples of “Should”:
  • “You should try to exercise every day.” (a recommendation to stay healthy)
  • “I think you should apologize to her.” (a suggestion based on what’s right or polite)
  • “Students should study hard if they want to do well.” (an encouragement rather than a strict rule)

In each of these examples, not following the advice is possible and might even be okay, but the speaker thinks it would be better if the advice were followed.

2. Must – Strong Advice or Requirement

“Must” is used for advice that’s urgent, essential, or often has serious consequences if not followed. When you use “must,” you’re expressing a strong necessity or emphasizing that something is very important.

• Examples of “Must”:
  • “You must wear a helmet when riding a bike.” (a safety rule that could prevent injury)
  • “She must submit her assignment by tomorrow.” (a deadline with potential consequences)
  • “If you’re feeling unwell, you must see a doctor.” (urgent advice to protect health)

In these cases, the speaker feels strongly that this advice should not be ignored, and there may even be rules or negative outcomes if it is.

Analogy to Remember the Difference 🌱

Think of “should” as a friendly reminder and “must” as a non-negotiable rule. For example, if someone is on a road trip:

• “You should take a break every few hours to stretch your legs.” (a friendly suggestion for comfort)
• “You must have your driver’s license with you.” (a strict requirement)

Practice Exercise

Try to decide whether “should” or “must” fits better in each sentence:

1. You ______ call your parents if you haven’t spoken to them in a while. (suggested, not required)
2. Drivers ______ obey traffic lights to avoid accidents. (strict requirement)
3. If you want to improve your grades, you ______ review your notes regularly. (friendly advice)
4. You ______ finish the report by Friday because it’s the final deadline. (urgent requirement)

Answers

1. should
2. must
3. should
4. must