To be (am, is, are, was, were)
Ben ik de beste werknemer? Am I the best employee?
Ben jij zijn manager? Are you his manager?
Is meneer Jackson er? Is Mr Jackson in?
Is dit zijn pen? Is this his pen?
Zijn we vrij? Are we free?
Zijn jullie blij? Are you happy?
Was hij hier? Was he here?
Waren zij op vakantie? Were they on holiday?