单数（主语单数）is,复数（主语复数）are,I 后面接am,was是is和am的过去式,were是are的过去式,
根据主语和时态的不同选择不同来选择be动词
The doors of the palace were made of beaten gold.
这句话的主语时doors是复数所以选择are,又因为这些门已经做出来了,是个过去的动作,所以要用are的过去式were
i'm just joking这句话对,I 后面用am不能用is
Be动词时态be made of造句是The doors of the palace were made of beat
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