By the time you arrive in London,we will have stayed there for two weeks.里面的主谓宾是谁?

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• By the time you arrive in London,we will have stayed there for two weeks.里面的主谓宾是谁?
• 麻烦好心人总结下定语从句time后用when引导的情况这几份资料把我弄糊涂了①当先行词为 by the time ,any time ,the way,every time,the first time ,the last time 时,关系词不用when而用that.或省略,但如果time前无修饰语,关系词用that when 均可②在定语从句中,time 有很多意思比如:I miss the time when we were together.It's the second time that I have seen the picture.第一句中time表示"时间,时候",第二句time就表示"次"③when引导定语从句表示时间[注]值得一提的是,表示时间“time"一词的定语从句只用when引导,有时不用任何关系代词,当然也不用that引导.By the time when you arrived in London,we had stayed there for two weeks.
• By the time you arrive in London,we will have stayed there for two weeks.求分析,时态,用法,还有定语从句when ,被省略了么?为什么用will 然后又用了have done 的句式?句子的意思是不是：当你到达伦敦的时候，我们已经在那边两个星期了？
• By the time you arrive in London,we will have stayed there for two weeks.求分析,时态,用法,
• By the time you arrive in London,we will have stayed there for two weeks.里面的主谓宾是谁?
• 四边形ABCD是平行四边形,E、F分别是 AC、CA 延长线上的点 ,且CF＝AE,那么BF和DE有什么关系?请说明理由．（2）如图14,在梯形 ABCD中,AB∥CD,AC与BD相交于点O．如果OA＝OB,试判断梯形ABCD的形状,并说明理由．
• 如图，BF平行于正方形ABCD的对角线AC，点E在BF上，且AE=AC，CF∥AE，则∠BCF的度数为______．