问题 一般现在时与一般过去时的混用

As the system makes the assessments, the facial regions that were most helpful in the determination are highlighted and made available for doctors to view.这句话的are为什么不用were(that后面是makes，and后面又是were，有点乱了)?

问题 句式分析

What would I not have given to be able to say the rules without a mistake!1）句中的not不能理解。可否去掉not呢？2）would have done 或 would not have done - 有几种含义理解呢？麻烦老师详解，谢谢！

问题 masks 谓语动词用are还是is等一些列问题求解

1.第一个基础疑问： masks 谓语动词用are 还是is？2.进一步疑问求解惑，有一处外文听力，第一个括号里表示听不清楚具体是什么词，第二个括号是擅自加上的：I know here  masks (are /is/ served / sold /  saw/ seen) (as) one of the most common thin...

问题 Given is/are 用在句首是什么意思

Given is/are 用在句首是什么意思？例句：Given also are the time periods, which set the long-term problem in years.

话题 are 与were

话题 were 与are

问题 of的用法

Of the nineteen recognized polar bear subpopulations, three are declining, six are stable, one is increasing, and nine lack enough data.1）of这里是什么用法？是作为介词相当于among吗？2）the 是否可以改为those?

问题 介词短语是否可以充当主语

A circle and within the circle are all the things that you are familiar with.这个句子是否正确？within the circle 是在这充当了主语吗？

问题 something 在否定句是变成 not anything 还是 nothing

He is something of a master在疑问句中可以something变成anything，那在否定句中呢？是用nothing还是anything呢？

问题 请讲解you guys are gonna be graduating soon,huh?的结构

you guys are gonna be graduating soon, huh?are gonna be = are going to be 但为什么后面 graduate 要用 ing 形式？

问题 If it were not for the rain,i would go hiking now.

请问下老师1. for the rain 可以写成for raning吗？2. 如果我要表示要不是现在正在下雨，我可以写成if it were not raining 吗？

问题 how you feeling?这句是不是省略了are?

 how you feeling?这句是不是省略了are?应为how are you feeling?是吗？

问题 as和than比较结构难点

...略现象太常见,不太理解比较项:He is more dead than (he is) aliveThey are more soldiers than ( they are) poets. He earns no more rewards than you (earn ?)I have no more than two dollars left in (I have money two dollars?) my pocket.请问这里比较项分别是怎么理解啊? 我看...

问题 请教：when not to do sth

...ff. 我不知道什么时候关掉机器。 但是，英语可以用when not to do sth吗？谢谢！

问题 I shall not trouble my sleep over it语法分析

你好，我想问一下这个句子的语法结构。