You must place heavier bags under the seat.
Heavier bags must be placed under the seat.
Close the gate after entering.
The gate should be closed after entering.
You can buy drinks from the flight attendant.
Drinks can be bought from the flight attendant.
You must switch off mobile phones.
Mobile phones must be switched off.
Place all waste in the bins provided .
All waste must be placed in the bins provided.
Return books on time.
Books should be returned on time.
Follow the safety instructions.
Safety instructions must be followed.
Keep the park clean.
The park must be kept clean.
You can use laptops during the flight.
Laptops can be used during the flight.
You can watch films on the screen in front of you.
Films can be watched on the screen in front of you.
You must remove shoes at security
Shoes must be removed at security
You must keep emergency exits clear.
Emergency exits must be kept clear.
Maintain silence in the library.
Silence should be maintained in the library.
You can store bags in the overhead lockers
Bags can be stored in the overhead lockers