infinitive :

     zijn                to be 

present :

    ik           ben          I         am
    jij          bent         you       are (informal, as a schoolteacher would adress a little kid)
    u            bent         you       are (polite/informal)
    gij          zijt         you       are (used when adressing divine/holy creatures/persons, archaeic)
    hij/zij/het  is           he/she/it is  

    wij          zijn         we are
    jullie       zijn         you are
    zij          zijn         they are

imperative :

    Ben!/Wees!/Weest!/Zijt!         Be!

past :

    ik           was          I         was
    jij          was          you       were
    u            was          you       were
    gij          waart        you       were
    hij/zij/het  was          he/she/it was  

    wij          waren        we   were
    jullie       waren        you  were
    zij          waren        they were