Must,Musnt’t

"Must" and "mustn’t" are modal verbs used in English to express necessity, obligation, or prohibition.

Must

Meaning: It indicates a strong obligation or necessity.

Usage:

• Obligation: "You must submit your assignment by Friday."
• Advice: "You must see that movie; it's fantastic."
• Logical conclusion: "She must be at home; the lights are on."

Mustn’t (Must Not)

Meaning: It indicates prohibition or something that is not allowed.

Usage:

• Prohibition: "You mustn’t smoke in here."
• Advice against something: "You mustn’t forget to lock the door before you leave."
• Warning: "You mustn’t go there alone."

Examples in Sentences:

1. Must:

   • "You must wear a helmet when riding a bike."
   • "We must finish this project by the deadline."

2. Mustn’t:

   • "You mustn’t talk during the exam."
   • "Children mustn’t play near the road."

Summary:

• Use "must" when imposing an obligation or necessity.
• Use "mustn’t" to express something that is not permitted or is prohibited.

Feel free to ask if you have more questions or need further clarification!