Must and have to

Use must and have to for obligation, rules and things that are necessary.

When do we use it?

Express everyday obligations and distinguish basic forms.

Form

Use must + base verb or have/has to + base verb.

• You must stop.
• I have to work.
• She has to leave.
• We must not park here.

Key contrast

Look for the subject, noun type, sentence form and time expression before choosing.

Common mistakes

• She have to go. → She has to go.
• You must to stop. → You must stop.

Remember

Use must and have to for obligation, rules and things that are necessary.

Quick check

• Read the complete sentence.
• Find the grammar clue.
• Choose the form that fits both meaning and structure.