如何判断英语句子的时态的被动语态

被动语态主要构成是 be done.怎么去判断时态,主要体现在动词be上边.am/ is / are + done 为一般现在时态被动was/ were done 为一般过去时态will be done 一般将来时态would be done 过去将来时态如果是做单选题时,一...