我觉得that 不是修饰 the amount of energy。 难道 the amount is visible and can be turn down and turn off??
请问第二个”that”跟据super_lee所说，” 在这种对比性的句式中，单数用that,复数用those.”，那可不可以以”it”代替呢??我知道用it代替很怪，可是不懂怪在哪里，that用在做代名词时和”it”有哪里不同呢??求助各大NN了~~~
同意that修饰equipment，但是
问题在与sth, such as ..., that ....
对于这种插入语的形式，是不是可以把插入语忽略，当作没有看见？因为我记得在语法里面，that在定语从句的时候前面是不能够有comma的？nn指教啊
对，一般情况下that前面是不可以有“，”的，这主要是说限定性修饰与非限定性修饰的区别，即that只可以做限定性定语从句的引导词。
但是有插入语的情况不同，因为插入语一般只作补充说明，不影响原句的结构和意思，所以也可以通俗的说“把插入语忽略”。
把兩個逗號插入句不要看 第一個that是限定用法修飾visible equipment跟which功能應該一樣 第二個that代the amonut of energy
搂主的问题好像还是没被解决啊，限定性定语从句that 引导，非限定性定语从句which引导，
我记得必须用that 的情况有：
前面限定词是1；形容词最高级 the most important thing that we know is ....不能用which
2；有人又有物 Mike and the dag that we saw are.....不能用which
必须用which 的情况是有介词在前，such as , in which , of which, to whcih,
还有什么？谁可以补充一下？这道题目中也可以用which 吗？
搂主的问题好像还是没被解决啊，限定性定语从句that 引导，非限定性定语从句which引导，
我记得必须用that 的情况有：
前面限定词是1；形容词最高级 the most important thing that we know is ....不能用which
2；有人又有物 Mike and the dag that we saw are.....不能用which
必须用which 的情况是有介词在前，such as , in which , of which, to whcih,
还有什么？谁可以补充一下？这道题目中也可以用which 吗？
请问： Equipment 不可数，为什么such as 后面的名词light和heaters不用单数，要用复数？
那个不是复数, lights是照明设备的总称
water heaters 是热水器的总称
可以用which，但用that也没错。两个逗号等于没有。
这个问题好像牛人还没有解释到底第二个that可不可以用it来替代呢？
这个问题好像牛人还没有解释到底第二个that可不可以用it来替代呢？
不可以，it是特指，that 是泛指
如果用it,指the amount of energy used by visible equipment, 而 that 单指the amount这个是被unobtrusive equipment用掉的energy.
.请问要用什么样的判断原则呢?
up
I also have this question
对于visible equipment, such as lights, that must be turned on and off
这个that 引导的是限制从句，还是非限制从句，还没有定论，
请牛人指教！
我觉得都行，如果是限制性
必须开和关的设备
非限制性
这些设备共同的属性是必须开和关，从意思上感觉差不多
visible equipment, such as lights, that must be turned on and off
-> visible equipment that must be turned on and off, such as lights
是不是可以看成，插入语的位置放到中间而已。并不影响句子结构。
不可以，it是特指，that 是泛指
如果用it,指the amount of energy used by visible equipment, 而 that 单指the amount这个是被unobtrusive equipment用掉的energy.
such as lights插入语
that是修饰的visible equipment
which的话就修饰lights，就变成一个长的要命的插入语了，
就是这样一个结构
visible equipment，【插入语+which修饰】，such as water heaters意思完全被破坏
such as lights插入语
that是修饰的visible equipment
which的话就修饰lights，就变成一个长的要命的插入语了，
就是这样一个结构
visible equipment，【插入语+which修饰】，such as water heaters意思完全被破坏
今天复习到这题，觉得如果换成which的话应该是逻辑上修饰equipment,语法上修饰lights，产生了不一致
that 用作指示代词的时候，可以指代一个名词词组、一个分句、一个句子或几个句子；但有时，that也可能仅指一个分句或一个句子中的部分内容。336-337
it 作第三人称代词时，它的先行词既可以是一个词组也可以是一个分句、一个句子或几个句子所表达的全部或部分内容。327
以上的两句话都是 《章振邦 新编英语语法》中的意思，那么在这道题中就是it和that 都可以的喽？
btw， 把E中的when 去掉就可以了吗？好别扭阿，请教大家了！
看到前人说it和that指代抽象 或具体一说，有什么根据吗？
longman中
it
1 used to refer to a thing, animal, situation, idea etc that has already been mentioned or is already known about
eg: 'Where's your office?' 'It's on the third floor.' I love the spring - it's a wonderful time of the year. There were people crying, buildings on fire. It was terrible! Don't blame me. It wasn't my idea. This little beast is a lemur and it lives in Madagascar.
that
3
plural those / ðəʊz $ ðoʊz /
formal used to refer to a particular person or thing of the general type that has just been mentioned
In my opinion, the finest wines are those from France.
that of
His own experience was different from that of his friends.
好吧，我找到了抽象和具体的区别，不过og中说的是BCE结构不对，没有说 it 使用错误呢，请指教阿！
it 和 that 不能指代句子
that修饰时，只能修饰先行词，
which用于非限制性定从的修饰，在GMAT中又就近和逻辑修饰，ETS希望这两个修饰能重合。
紫OG对BCE都有这样的解释“such as lights”is not parallel to "unobtrusive"这是什么意思啊？
望NN们排解疑惑～～
紫OG对BCE都有这样的解释“such as lights”is not parallel to "unobtrusive"这是什么意思啊？
望NN们排解疑惑～～
the amount of energy used by visible equipment .......与....
thatused by unobtrusive equipment
这两个是parallel的
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