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There are six classes in Grade One.

Which class are you in?

work team

Class One, Grade Three/Year Three

intensive training class

correspondence class

beginner's/intermediate/advanced class

graduation class

be in the same class/group

attend an English class on weekends

open a class; institute a class; start a class

teach two classes

run a class in accountancy

It is time to go off work/knock off.

work in three shifts

work the day/night shift; be on day/night duty; be on the day/night shift

These young people work with vim and vigour.

There is a train on the hour.

take the next plane/flight