Somethings about English

在定语从句中，关系代词which和 that都可指物，一般情况下，可以互换使用。但在下列情况下值得注意：
A. 只能用that而不能用which的情形
(1) 当先行词为：all, little, few, much, none 及 some-, any-, no-, every- 与 thing 所组成的复合单词时，只能用that。如：
There is nothing that will stop us making progress. 没有事情会阻止我们进步。
(2) 当先行词前面有only, some, any, no, every, little, few, much, all, very等形容词修饰时，只能用that。如：
This is the only problem that we can’t work out. 这是我们不能解决的唯一的一个问题。
3) 当先行词由形容词的最高级或序数词修饰时，只能用that。如：
This is the most interesting book that I have ever read. 这是我读过的最有趣的书。
4) 当先行词同时包括人和物时，只能用that。如：
Luxun and his works that we are familiar with are considered great. 人们认为我们所熟识的鲁迅及其作品都很伟大。
(5) 当先行词在定语从句中作表语时，只能用that。如：
This is a book that I have been looking for since last week. 这就是那本自上周以来我一直在寻找的书。
(6) 当主句是以which开头的特殊疑问句时，只能用that。如：
Which is the picture that you drew yesterday? 你昨天画的那张画是哪一张？
B. 只能用which而不能用that的情形
(1) 当非限制性定语从句中的先行词指物时，只能用which。如：
The pencil-case, which I bought last week, is missing. 那个铅笔盒，我上周买的，现在不见了。
(2) 关系代词前面有介词时，只能用which。如：
The tree under which we used to take a rest has been cut down. 我们过去常在下面休息的那棵树已砍掉了。
(3) 先行词为代词that或that所修饰时，只能用which。如：
I don’t take that which is too expensive. 我不要太贵的那一个。
who (whom) 和that的用法区别详解:
在定语从句中，关系代词who (whom) 和that都可指人和物，在一般情况下，可以互换使用，但在下列情况下值得注意：
一、用who (whom) 而不用that的情形
(1) 在非限制性定语从句中的先行词指人时，只能用who (whom)。(2) 当定语从句对指人的先行词进行隔位修饰时，只能用who (whom)。如：
Do you know the girl in front of the blackboard who is speaking to the students? 你认识黑板前面正在给学生们讲话的那位女孩子吗？
(3) 当先行词为people和those时，只能用who (whom)。如：
Those who want to go there come here please. 那些想去那儿的人请来这边。
(4) 当先行词为one, ones, anyone, everyone, none, all(指人) 时，只能用who (whom)。如：
Anyone who is against us is our enemy. 任何反对我们的人就是我们的敌人。
(5) 先行词指人，而关系代词在从句中作主语时，一般多用who。如：
The man who came here yesterday said he would come again in a few days. 昨天来这儿的那个人说过几天他会再来。
二、用that 而不用who (whom)的情形
After to, you should use base form.

I think 'studies' is the simple present tense when 'he' she it is before it.

Sorry, I don't know the meaning of the first sentence.

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