To express 'necessity' we use the modal

Question

Accepted Answer

To express 'necessity,' we use the modal "must." Here is a detailed explanation justifying why Option 2 is correct and why the other options are incorrect:

1. **Explanation for Option 2 ("must"):**
   - The modal verb "must" is used to express strong obligation or necessity. When something is essential or required, "must" is the appropriate choice. For example, "You must wear a seatbelt while driving" indicates that wearing a seatbelt is necessary and obligatory. In English, "must" conveys a sense of urgency and importance, making it the correct choice for expressing necessity.

2. **Explanation for why the other options are incorrect:**

- **Option 1 ("may"):**
     - "May" is used to express possibility or permission, not necessity. For example, "You may leave early if you finish your work" suggests that leaving early is possible but not required. It does not convey the sense of obligation or necessity that "must" does.

- **Option 3 ("can"):**
     - "Can" is used to express ability or permission. For example, "She can swim" indicates that she has the ability to swim. While "can" can sometimes imply permission, it does not express necessity or obligation. Therefore, it is not suitable for conveying necessity.

- **Option 4 ("might"):**
     - "Might" is used to express a weaker possibility than "may." For example, "It might rain tomorrow" suggests that there is a chance of rain, but it is not certain. "Might" does not convey necessity or obligation, making it an incorrect choice for expressing necessity.

In conclusion, "must" is the correct modal verb to use when expressing necessity, as it clearly communicates a strong obligation or requirement. The other options, "may," "can," and "might," do not convey the same level of necessity and are therefore incorrect in this context.