Passive with Modals

The buses_______________ get very crowded before they built new undergrownd.

The note _____________ because the handwriting was very messy .

Your sister______________ been consulted the doctor earlier .

Parents________________ allowed to come with their kids .

He ___________________ a very good student to show excellent knowledge .

The patients ______________ by doctors carefully .

The competition ________________ if they hadn't canceled it .

The ambulance __________________ immediately after the accident.

The patient leaflet _______________ carefully before taking the pills .

The trees ________________ planted in spring or in autumn .

People ________________ to behave nature- friendly both at schools and at homes .