You and your team are locked inside a mysterious escape room. The lights are low. Strange symbols are glowing on the walls. A digital clock is counting down. You only have 40 minutes to escape. The door will open only if you follow the instructions correctly. Some actions are necessary to move forward. Some actions are dangerous and can stop the system. Look around carefully. Think before you act. Every decision matters. Read the rules. Work together. Escape in time.
Rules appear on the screen:
You must press the red button first.
You must find the hidden code in the room.
You mustn’t touch the exposed wires.
You mustn’t open the metal box too early.
One wrong decision can lock the system forever.
You must press the red button first.
You must find the hidden code in the room.
You mustn’t touch the exposed wires.
You mustn’t open the metal box too early.
One wrong decision can lock the system forever.
Understanding the Rules
In the escape room, some actions are necessary to solve the task. Some actions are dangerous and can stop your progress. English uses special verbs to show strong rules. These are modal verbs. Let's take a more detailed look about the modal verb "must" that you probably noticed in sentences about rules.
In the escape room, some actions are necessary to solve the task. Some actions are dangerous and can stop your progress. English uses special verbs to show strong rules. These are modal verbs. Let's take a more detailed look about the modal verb "must" that you probably noticed in sentences about rules.
Rule 1 — Strong obligation
We use "must" to express strong obligation. They can be external rules or laws but they can also express an obligation or strong advice.
Example from the escape room:
You must press the red button first.
Meaning: pressing the button is necessary for the next step.
You must press the red button first.
Meaning: pressing the button is necessary for the next step.
Rule 2 — Strong prohibition
Example from the escape room:
You mustn’t touch the wires.
Meaning: touching the wires is not allowed because it can cause failure or danger.
We use "must not (mustn't)" to express strong prohibition when an action is not allowed because it is dangerous, incorrect, or can cause problems.
You mustn’t touch the wires.
Meaning: touching the wires is not allowed because it can cause failure or danger.
Formation
Rule 1 — Verb form after "must" / "mustn’t"
After "must" and "mustn’t", we use the base form of the verb (infinitive without "to"). Structure: must + base verb; mustn’t + base verb
Examples from the escape room:
You must find the hidden code. (not: must to find)
You mustn’t open the box too early. (not: mustn’t to open)
Rule 2 — No -s after "must" / "mustn’t"
Examples:
The player must press the red button first. (not: must presses)
Modal verbs do not change their form. We do not add -s after he / she / it. Structure: subject + must + base verb; subject + mustn’t + base verb.
The player must press the red button first. (not: must presses)
Rule 3 — Same form for all subjects
"Must" and "mustn’t" have the same form for all persons. They do not change with I / you / he / she / it / we / they.
Examples:
I must follow the instructions.
She must follow the instructions.
They must follow the instructions.
I must follow the instructions.
She must follow the instructions.
They must follow the instructions.
Rule 4 — Questions with "must"
Examples:
Must we press the red button first?
Must the team find the hidden code?
Meaning: we ask if something is necessary.
To form questions, we put "must" before the subject. Structure: Must + subject + base verb?
Must we press the red button first?
Must the team find the hidden code?
Meaning: we ask if something is necessary.
Rule 5 — "Must" expresses strong rules
We usually use must when a rule is:
- very important;
- necessary for success;
- related to safety;
- based on instructions or authority.
Examples from escape room context:
You must follow the correct order.
You mustn’t make random choices.
You must follow the correct order.
You mustn’t make random choices.