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问题 be able to后到底能不能接动词的被动式

关于 be able to 后能不能接被动式的问题，有点乱：有的人说不可以，有的人说可以。网上说法也有不一致的地方。请专家老师梳理一下比较权威的观点，让我们心里有个定数。送鲜花10朵，谢谢老师！

问题 I was supposed to wait until after....为什么有两个介词？

I was supposed to wait until after....为什么有两个介词？

问题 date at和date to的区别

...公元前500年左右。老师， 想问一下这句话为什么不用date to ， 我在网上搜到date at 强调发生到现在经过的时间有多长， 但是原文是个时间点呀。谢谢

问题 关于非谓语to be done和done的区别

...成，是否以谓语的时态来区分？比如：There are some letters to be sent. (将要被send)I found my bike stolen. (在我发现之前就被偷了)

问题 不定式和现在分词的区别(for sb doing与for sb to do)

So the U.S. Surgeon General has suggested that e-cigarettes may be a useful toolfor adults trying (try) to end their tobacco use,or quit.为什么空格部分不能用不定式to try?（空格部分为 trying）

问题 it是省略：The box is too heavy for me to carry (it).

The box is ( ).A. too heavy for me to carryB. too heavy for me to carry it书上说A当然正确，但是说B也是正确的。为什么呢？这是不定式的悬空结构吗？麻烦老师详解一下，谢谢！

问题 spring to one's relief 是什么意思？尤其是spring在这里的用法和含义？

"Whoever can look upon that mother's grief without springing to her relief has a heart of stone." 请教老师：spring to one's relief 是什么意思？ 尤其是spring在这里的用法和含义？麻烦老师帮忙翻译一下。谢谢！

问题 句子成分分析

That's the time which she's found to be convenient for both of us to meet.请问句子中 "to be convenient" 是作为time的宾补吗? ,为什么 find sth adj 还要加to be?"for both of us to meet" 在这里是作为什么成分?

问题 关于英文破折号使用

It’s hard not to wonder how subsequent events in her life—consequential as they have turned out to be to conservation, to science, to our sense of ourselves as a species.句式结构看不懂，尤其是破折号的地方。

问题 Up to ￡10 off latest models.是什么意思（促销广告语）

在一本英语教科书上的一段文字中，出现了某商店对其商品的促销标语：Up to ￡10 off latest models.请问这句话是什么意思？

问题 so as to 中的 so 是连词，as是什么，是代词吗

The dog is chained up so as not to hurt people.老师，so是连词，as是什么，是代词吗，什么代词，代替前面整个句子吗？

问题 sth is difficult to do中的不定式充当什么成分

At first my new surroundings were difficult to tolerate. 不定式在这里充当状语么？那是什么状语呢？

问题 The trachea is normally located posterior to the

 The trachea is normally located posterior to the thyroid isthmus in the midline请问老师这句话中 in the midline是说的前边的thyroid isthmus还是The trachea。怎么判断说的是那个？

问题 They are days to eat a big breakfast 如何翻译

They are days to eat a big breakfast.如何翻译呢？其中的不定式是做be动词的表语么，还是做days的形容词呢？

问题 发生在过去动作之前为什么不用过去完成时

What else could they do? In order to cure her father, the daughter went about and managed to scrape together 500 yuan which she handed to the man just before her father went to live.此句中的 handed to the man 这一动作，看起来是在went to live之前，为什么不用过去完成时态?