英语时态：When all those present were seated he began his lecture.When all those present were seated he began his lecture.观众入场以后他才开始演讲,那观众入场就是过去的过去,应该用过去完成时的被动语态猜对呀,
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英语时态：When all those present were seated he began his lecture.When all those present were seated he began his lecture.观众入场以后他才开始演讲,那观众入场就是过去的过去,应该用过去完成时的被动语态猜对呀,
英语时态：When all those present were seated he began his lecture.
When all those present were seated he began his lecture.
观众入场以后他才开始演讲,那观众入场就是过去的过去,应该用过去完成时的被动语态猜对呀,为什么这里用的是一般过去时的被动语态?
英语时态：When all those present were seated he began his lecture.When all those present were seated he began his lecture.观众入场以后他才开始演讲,那观众入场就是过去的过去,应该用过去完成时的被动语态猜对呀,
Be seated,please.请坐.（很礼貌的用法）
seat sb.某人就座（有安排,使的意味 ）
seat 的特点是作动词时为及物动词,后面必须有宾语或用其被动语态
这里的When all those present were seated,只是一种观众就坐的状态
用When引导的时间状语从句
“那些到场的人全坐下时,他才开始演说”,
前半句是时间状语从句,且从句有被动意思.主从句时态保持一致,主句he began his lecture,为一般过去时态,所以从句也要用一般过去时态,
be seated意为“就坐”，就是坐好的意思，是静止的状态。而且本句不强调动作的先后啊，when是同时的意思
首先“be seated"是固定短语，意为 “坐下”，等于=“sit sown"， 而不是表示被动。其次，表示过去的过去不一定非得用过去完成式，因为在这里动作的顺序表示的很清楚。又如：I wore the necklace (which) my grandmother (had) left me. 我戴着祖母留给我的项链。
were seated不是被动语态，而是系表结构，这里“seated"作形容词用，是指”他们“都”坐下“这种状态，所以用一般过去时。