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问题 used to的用法与理解

Planes, helicopters used to fight the fire句子来自2019版人教版高中英语新教材必修一的 Unit 3（p49）。请分析used to 的用法，好像句意有点奇怪。

问题 现在分词置于句首可以倒装吗

Compounding the situation has been a lack of money.请问老师这是一个什么类型的倒装句呢？现在分词置于句首可以倒装吗？

问题 phonetic system什么意思

这里的phonetic system什么意思？音系？written script什么意思？如何理解？如何翻译了？When Wang developed his Mandarin Alphabet, his contemporaries were still debating whether the written script should be superseded by a phonetic system—like Romanization.

问题 逗号后的不定式作什么成分

These people left the village, never to return.请问这个逗号后的不定式作什么成分？

问题 but与while区别难点

My wife likes to spend his holidays doing shopping, _______ I like to drink with my friends in my spare time. 此题的答案是while，请问可以填but吗？在这样的句子中but与while有什么区别？

问题 have（表示"有"）能否用于现在完成时

Everyone in England has had some kind of education. 记得老师曾说过：静态动词通常不用于完成时态的，但这里的 has had 怎么又用了现在完成时呢？

问题 ought to的宾语

Alan," said Hughie in a bad temper," and not have let me make such a fool of myself."not have let me make such a fool of myself 中的 not 是否定 have 吗？这半句是做ought to 的宾语吗？ 

问题 less than在句中作什么成分

Your sister will be here in less than an hour.less than在句中作什么成分？less是形容词还是副词？than是介词吗？

问题 为啥介词后we doctors ourselves

Actually a much more common problem is in fact caused by  we doctors ourselves.请问是不是，we doctors ourselves 印刷错误？看不懂啊，介词后面一般就是跟名词，这里是一串

问题 see和know在这里的用法

I have know men come to London full of bright prospects and see them complete wrecks in a few months through a habit of answering letters 。如题

问题 介词of使用迷惑

1）What example is given of a story that includes an evil witch ?2）What is an example of a moral that appears in Grimm's fairy tales ?以上2句中的of使用结构含义一样吗？第一句中的of是不是等于about？但是第二句又不能用about替换了吧？麻烦老师详解！

问题 怎么区分是被动语态还是过去分词

Opportunity is missed by most people because it is dressed in overall and looks like work. 这句话里missed, 是被动式呢，还是形容词呢？is 后面加动词过去分词，怎么区分是被动语态还是过去分词？

问题 over time中间是省略了冠词吗

Customs play a significant role in festivals, but sometimes they can change over time.请问over time为什么没有冠词？是省略了冠词吗？

问题 nice to meet you与nice meeting you的区别

...eased to meet you (= used to greet someone politely when you have just met them for the first time) 认识你很高兴“This is my niece, Sarah.” “Pleased to meet you.” “这是萨拉，我的外甥女。”“很高兴认识你。”(it was) nice meeting you (=used to say goodbye polit...

问题 介词可以有比较级形式吗

在 I'll tell you nearer the day 这个句子中，nearer 之后没有介词 to，那么 nearer 就是介词了。我的问题是：介词可以有比较级形式吗？烦请专家老师解惑，谢谢！