Cars must not be parked in front of the gate. The underlined modal auxiliary shows :

Question

Accepted Answer

The underlined modal auxiliary "must not" in the sentence "Cars must not be parked in front of the gate" shows **Prohibition**.

Here's why:

*   **Prohibition:** "Must not" (or its contraction "mustn't") is a strong way of saying something is not allowed. It indicates a rule or law that forbids a particular action. In this case, parking in front of the gate is strictly forbidden.

Now, let's look at why the other options are incorrect:

*   **Permission:** Permission implies allowing someone to do something. "Must not" does the opposite; it denies permission.
*   **Necessity:** Necessity suggests something is required or essential. While there might be a *reason* why parking is prohibited (perhaps for emergency access), "must not" directly expresses the *ban* on parking, not the underlying need for the ban. "Must" (without the "not") would indicate necessity.
*   **Request:** A request is a polite way of asking someone to do something. "Must not" is a direct and forceful command, not a polite request.