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问题 fron then on后跟什么时态（一般过去时还是现在完成时）

...们老师说选什么都不该选C，她说应该用完成时，用 have been to。我很疑惑，我也在网上查了，大多数都说用一般过去时，但也有少数说用完成时，到底用什么？我觉得是 since then on 才用完成时。麻烦解释一下！

问题 请问有没有老师分析：evidence的同位语从句，觉得难以理解。

...①不懂的句子如下：She soon found evidence that Standard Oil had been using unfair and illegal methods to destroy other oil companies."There is increased evidence that it helps shorten the duration of the common cold sometimes even by two to three days.我觉得：that后面的内容是要...

问题 副词可以连接句子吗

They knew it was futile，still they fought on.still 作为一个副词怎么可以连句子？应该加一个 and 呀  如果这是对的 请问相同用法的还有哪些  老师们能多给几个例句吗？谢谢！

问题 关于it指代人

请问一下，it怎么指人。Suddenly,my eyes fell on a photograph.It was a little girl wearing a carefree smile.我查词典it可以指代不明性别的动物，可她说了是女生。谢谢了！

问题 since的用法

语法上since后面加上延续动词或状态的动词的过去式表示动作结束以来，那么 I have known her since I was a little boy. 请问这句话能翻译为：自从我是一个小男孩的时候我就认识她了  有问题吗？

问题 until还是when

One day he was playing basketball ______ he fell and brock his leg.空处填until还是when?我认为是填until，因为是:直到他摔伤了腿为止，他一直在打篮球。

问题 句子成分的问题

I heard she was pronounced dead on arrival at the hospital.请问下,dead在这里是主补还是宾补? on arrival理解为时间状语,at the hospital理解为地点状语,这样对吗?

问题 怎么分辨强调句和主语从句？

It was in class that our teacher praised Tom. 请问这是主语从句，还是强调句？怎样分辨它们？

问题 persuade可后接that从句吗

persuade可后接that从句吗？比如可以说She persuaded that he was telling the truth 吗？

问题 关于表语补足语that

I was worried you guys were gonna be vague about this.如果把这句话理解为表语补足语的that从句？那此处的that也可以省略吗？谢谢老师解答！

问题 that引导主语从句的疑惑

She would marry him in spite of my warning that it was unwise.麻烦老师分析一下这个句式，为什么可以这么倒装？

问题 一般过去还是过去进行

有这样一道题：The first time I _______ (drove/was driving） on a country road, I saw a bird flying in front of my car. 应该选择哪个比较准确？

问题 不定冠词a的问题

It was (a) Monday morning, and the writing class had just begun.Monday morning前是否要加不定冠词a？

问题 句子成分分析

Ove shakes his head. It is unclear to whom the Lanky one was primarily aiming what he just said.上面的句子，想问下 what he just said 是做什么成分，它是 it 的主语吗？没有看明白这个句子的结构！

问题 这个表语的成分是什么

our是代词不能单独出现那么knowing肯定是动名词那为什么not是副词可以否定knowing了？The greatest trouble was our not knowing all the details