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问题 and hence后面的省略疑问

请问这是个什么句子 and hence后为什么主谓都省略了? and hence中的and和谁是并列关系？ Under modern conditions,this requires varying measures of centralized control and hence the help of specialized scientists such as economists and operational research experts.

问题 as it happens的as是什么词性（引导什么从句）

We met her only yesterday, as it happens. 我们只是在昨天才与她偶然相遇。as 是连词吗，那as引导的是那种从句？

问题 对have you seen it的疑问

Have you seen my paper? I remember putting it on the desk.  你看到我的试卷了吗？我记得放在桌面上的。Have you seen the film? Yes, I saw it last night.  你看过这部电影吗？是的，我昨晚看的。这两句话都是现在完成时have you seen,一个是你...

问题 比较级中的替代可以用it代替that吗

The population of China is larger than (     ) of America.这个句子括号位置只能用 that 吗? 为什么不能用 it 代替?

问题 Legend has it 是属于一种什么形式的表达方式

请问这句话当中起头Legend has it是属于一种什么形式的表达方式，并请再举一些其他例句来说明

问题 一篇四川大学考博阅读文章

...ve language. A comparison of the three-year exit rates for students in ESL and bilingual programs shows that those who receive ESL instruction test out faster and in higher percentages than those who receive instruction in their native language, regardless of the grade in which they entered school. ...

问题 主谓一致：a year and a half & an apple and a half

A year and a half has passed.为什么句子必须单数谓语动词，仅仅是因 a year and a half被看作整体吗？a year and a half作主语可以用复数动词吗？如果不是用于时间呢？比如下面这句，谓语动词用单数还是复数：An apple and a half _____ eaten by the...

问题 老师好，请问 It is wrong the way they treat that poor an

似乎和Just do it the way i do.的the way不一样，It难道是形式主语？这种指代名词的形式主语倒不常见，请老师指点

问题 It takes sb st to do sth 的时间名词特点

见过这样的句子：It took us three hours to do the work.It took them five months to win the war.其中的时间名词都是three hours, five months, ten minutes, two weeks 等。但是，能不能用 all week, all month, all year, all morning, all afternoon 这样的词语呢？

问题 be it in food...是什么用法

She exhibits the idealism common to many advocates of sustainability, be it in food or in energy.请问老师，这里这个be什么意思？一个句子中，不是不能两个动词吗？该如何理解？还有 common to 作形容词短语修饰idealism，哪些情况下可以形容词短语作...

问题 It is time for supper 的句子成分分析

It is time for supper 的句子成分分析。句子中的介词短语 for supper 是什么成分？是定语吗？我在语法书上怎么没有找到这样的分析呢？

问题 从句判断（His height is double what it was...）

 His height is double what it was three years ago.请问,句式上不太明白这是什么从句?

问题 try it out loud这个句型不懂之处

try it out loud.out有完全彻底的意思修饰loud，out loud 是副词词组是修饰动词 try，可是try词义是努力，try词义和out loud不符，该怎么翻译？这又是什么句型？

问题 You may use it however you like 怎么翻译

老师您好！请问 You may use it however you like.这句话怎么翻译，尤其是however怎么翻译，有何翻译技巧。

问题 It helps me to relax.

help可以这么用么？还是要把to删掉。