老师问几个问题
电影中的台词just a couple of guys hanging out and playing pokers.这里的just作为副词后面不是跟原形吗，为什么加doing sth？
the ideal arose because of the perplexing behavior of the womenin the plant. because of在这里是引导宾语从句吗？
Other models exist that are hybrids of these three, such as delayed open-access, where journals allow only subscribers to read a paper for the first six months, before making it freely available to everyone who wishes to see it.
这个句子的主干是other models exist那么这个exist是不及物动词吧。那么后面这个journals allow only subscribers to read a paper 这里的journal又不是人怎么可以allow呢，还有后面before making it freely available to 这里也省略了journal making it freely available to可以这么用吗？
the railroad industry as a whole,despite its brightening fortunes,still does not earn enough to cover the cost of the capital it must invest to keep up with its surging traffic.这里的 it must invest to keep up with its surging traffic的前面省略了that的定语从句可以改为it must invest the cost of the capital to keep up with its surging traffic 那么这里的to keep up with its surging traffic是作定语呢还是目的状语呢？
just可以修饰表示数量的词
没有just后面 必须跟原形的说法
2the ideal arose because of the perplexing behavior of the women in the plant.
because of在这里是短语介词 也就是该短语相当于一个介词
所以because of the perplexing behavior of the women in the plant.是一个介词短语 作状语
不是从句
because of不能引导从句
arise是不及物动词 后面不能有宾语
3Other models exist that are hybrids of these three, such as delayed open-access, where journals allow only subscribers to read a paper for the first six months, before making it freely available to everyone who wishes to see it.
这个句子的主干是other models exist这个exist是不及物动词。that从句是分隔式定语从句
后面这个journals allow only subscribers to read a paper 这里的journals可以allow
VERB 使能够；促使 If one thing allows another thing to happen, the first thing creates the opportunity for the second thing to happen.
如The compromise will allow him to continue his free market reforms.
妥协将使他得以继续他的自由市场改革。
后面before making it freely available to 这里没有省略journal 。这不过是一个介词短语
动名词短语作介词宾语
4the railroad industry as a whole,despite its brightening fortunes,still does not earn enough to cover the cost of the capital it must invest to keep up with its surging traffic.这里的 it must invest to keep up with its surging traffic是前面省略了that的定语从句
可以还原为it must invest the cost of the capital to keep up with its surging traffic
这里的to keep up with its surging traffic是目的状语追问
before making it freely available to everyone.原文上写的是省略主语的时间状语从句，那也可以加上主语的吧before journals make it freely available to everyone .如Put out the fire before going to bed不是可以改成before you go？
追答省略主语的时间状语从句，这种说法不妥
因为从句作状语、分词短语作状语、介词短语作状语 是不同的语法概念 不可混为一谈
不属于 省略 的 问题
before making it freely available是介词短语作状语
before journals‘ making it freely available是介词短语作状语，动名词的复合结构作介词宾语
before journals make it freely available是从句作状语
Put out the fire before going to bed可以改成before you go
但前者是简单句 改过以后就成了复合句
再如 形容词作定语 总不能说是定语从句的省略吧
如he is a good student=he is a good student who is good
答案解析：driving 是动名词做定语修饰后面的名词，驾驶考试，所以需要driving
2.she admitted （to）having done wrong （她承认她做错了）为什么又有ing又有过去分词？是关于不定式的语法吗？
答案解析：admit to doing sth 后面to 是介词标志， 根据动作发生在谓语之前，因此需要动名词完成形式，也就是having done ，同时前面介to 后面现在完成也需要变为having
3.i don't like to hear children swearing （我不喜欢听孩子门发誓）为什么swear要加ing？
答案解析：上面句子结构，hear Sb doing sth ， 听见某人正在说某时，现在分词doing 做宾语补足语用法
4.he usually can come up with good ideas in time of difficulty（在通常在困难的时候都会想到一个好主意/想法）he不是三单吗，为什么come不加s？
答案解析：因为句子谓语由：情态度动词+（不带to 动词不定式；也就是动词原形）所以come不能后不能加s
5.note how i do it （注意 我是怎么做这个事情的）祈使句为什么不是noting？
答案解析：其实祈使句首个单词需要用动词原形，表示一种命令，请求，省略主语第二人称
6.he ran rather than walked （他宁可跑也不走路）ran为什么不加s？
答案解析：He ran rather than walked ， 都是用一般过去式，保持时态一致，
ran 是 run 过去式形式
hanging out and playing pokers现代分词状语修饰guys，just是修饰a couple of guys，与后面无关。
不是，后面是一个单词，behaviour，有前置限定性定语perplexing和后置定语of the women in the plant。
journal可以allow的,allow的主语不一定人呀，你可以百度翻译allow，查一些用法就明白了。before making it freely available to是正确的，而且必须省略journal。加上了从句结构不正确了。
目的状语
