That 在定语从句中不做成分有不会引起歧义时，可以省略。
That 在引导宾语从句时不能省略。
That 在主语从句时... I'm not sure。
任何代词在句子中作一必不可少的成分时是不可以省略的，that 也不例外。
OG212, The Baldrick Manufacture Company has for several years followed the policy aimed at decreasing operating costs and improving the efficiency of its distribution system.
那这道题中的画线的定语从句中的THAT是不是做主语,是不是被省略掉了呀?
这里省略的是 that is, 已经不单单是省略that 了。
但 that 在这里补全后是做主语的，为了简洁，主谓同时省略了。
是不是因为这里面被省略的THAT IS不是必不可少的,所以可以省?
小I 收到了你的短信，这几日JJ最后的总结加上一些其他的总结工作，都没有来语法区，实在是很抱歉。
关于that的省略问题，首先注意只有限定性定语从句才能省略，非限定性定语从句绝对不能省略，在下列情况下，可以省略关系代词：
1. 当关系代词在从句中担任动词宾语的时候
The people (who) we met at the party were very friendly to us.
2. 关系代词在从句中作介词，而介词在句尾时
Here is the man (that) you have been looking for.
3. 关系代词在从句中作表语时
Shang Hai is no longer the city (that) it used to be.
4. 在there be句型中，和先行词为way时，关系代词总是省略
There is an old man (who ) wants to see you.
I don’t like the way (that) you talk to somebody else.
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同时我搜索了一下网络，发现这个帖子关于定语从句中关系代词省略与保留，讲的非常的详细，贴上来给大家看看：
http://edu.sina.com.cn/en/2004-06-28/23121.html
我们知道，关系代词在定语从句中作宾语时可以省略，但也有几种特殊情况，关系代词不用作宾语也可以省略，同学们学习和使用时请注意。
在下列情况下,引导宾语从句的关联词可以省略。
一、that在定语从句中作表语时。例如:
She is all (that) a teacher should be. 她具备一个老师应该具备的所有条件。
二、that在从句中作补语时。例如:
I'm not the fool(that) you thought me. 我不是你以前所认为的那个傻子了。
He is the nicest teacher (that) the students consider him in their school. 他就是学生认为学校中最好的那个老师。
三、作状语时的省略。
1. 当先行词是reason,且在定语从句中作原因状语时,可以用关系副词why或关系代词that,也可以省略。例如:
The reason (why/that) he failed was his laziness. 他失败的原因是因为他懒惰。
That is the reason I did it. 那就是我做那件事的原因。
2. 当先行词是way,且在定语从句中作方式状语时,关联词可用in which或that,也可以省略。例如:
The way(in which/ that) these comrades look at problems is wrong.这些同志看待问题的方式是错误的。
That was the way(in which / that) she worked the problem out. 她就是用那种办法解决问题的。
3. 当先行词是time时,关联词可用when, that或省略。例如:
The second time (that) I saw him was in 2000. 我第二次见到他是在2000年。
I don't know the exact time (when/ that) the sports meeting will take place. 我不知道运动会举办的确切时间。
4.当先行词是place时,关联词可用where,that或省略。例如:
The place(where/ that) we will have our picnic is not decided yet. 我们举行野餐的地点还没定下来。
This is the right place he was born.这儿就是他的出生地。(注意:句末不可用介词in)
同学们往往认为关系代词作宾语时就一定可以省略,其实不然.在下列四种情况下,关系代词虽作宾语,却不能省略。
一、在介词+whom /which结构中, whom, which不能省略。例如:
Do you know any shops nearby in which I can buy flowers?你知道附近有可以买到花的商店吗?
That is the headmaster with whom my father was talking just now.刚才和我爸爸交谈的那个人是校长。
二、在非限制性定语从句中,作宾语的关系代词也不能省略。例如:
Mr Green, whom you know, is the tallest in our school. 格林先生是我们学校里最高的,你也认识他。
The elephant is like a spear, as anyone can see. 大象像长矛,任何人都知道。
三、在the same ... as, such ... as, as ... as, the same... that结构中, as, that 即使作宾语,也不能省略。例如:
I have bought the same bike as you (have). (指同类用as)我买了一辆和你的一样的自行车。
This is the same book that I read the day before yesterday. 这就是我前天读过的那本书。(关系代词that如要换成as, 则指与我读的书一样,而不是同一本。)
四、当and, but, or等连词连接两个或两个以上的定语从句修饰一个先行词时,关系代词第一个可省略,第二、第三个等不可省略。例如:
This is the book (which) I read yesterday and which I found very interesting. 这就是我昨天读的那本书,它很有趣。
You have many people around you (whom) you always turn to and whom you will never forget.你身边有很多人,你经常向他们求助,你永远不要忘记他们。
OG212, The Baldrick Manufacture Company has for several years followed the policy aimed at decreasing operating costs and improving the efficiency of its distribution system.
那这道题中的画线的定语从句中的THAT是不是做主语,是不是被省略掉了呀?
这难道不是分词短语做定语么？因为policy是被aim的，所以用过去分词。为什么要理解成定语从句省略主谓呢？
超级感谢JOE11 GG和古镯MM的帮助.YOU GUYS ROCK!
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