Learning how to use “have to” and “must” correctly is an important part of English grammar. Both phrases are used to talk about rules, duties, and things that are necessary.
The Main Difference
Both words show that you are required to do something, but the reason why you must do it is different.
1. Must Use “must” when the feeling comes from the speaker. It is personal. It is used for strong advice or when you feel deep inside that something is important.
- Usage: Giving orders, strong advice, or personal duty.
- Example: You must wear a helmet while riding a bike. (The speaker thinks this is essential safety advice).
2. Have to Use “have to” when the rule comes from the outside. It is not just an opinion; it is a fact, a law, or a rule made by someone else (like a school or government).
- Usage: Laws, school rules, or daily routines.
- Example: Students have to wear the school uniform every day. (This is a school rule, not a personal choice).
When to Use “Must”
You should use “must” for:
- Giving strong instructions.
- Talking about moral duties.
- Warning someone or giving strong advice.
Examples:
- You must not waste food.
- We must save electricity.
When to Use “Have to”
You should use “have to” for:
- Rules made by an authority (like the police or a teacher).
- Talking about daily routines.
- Describing duties you cannot avoid.
Examples:
- Students have to wear the school uniform.
- Visitors have to keep silence in the library.
