(something) must be (done)
This is a form that people use for giving formal instructions. It means that everyone has to do this. For example:
Seat backs and tray tables must be placed in their upright and locked positions.
This phrase appears in these lessons:
- “All reimbursement requests must be submitted by Dec. 8th.”
- “All baggage must be stowed in the overhead container.”
- “Seat backs and tray tables must be placed in their upright and locked positions.”
- “Please note that all applications must be accompanied by two letters of recommendation.”
- “All children under the age of 13 must be accompanied by an adult.”
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