学习一生定语从句的that省略
导语：在学习英语的过程中，我们常常会遇到连接词that省略的情况。而一旦省略，对同学们的从句识别和判定会带来一定的困难，从而影响阅读的理解和翻译。下面我们就来看一下，三种从句中连接词that省略用法的几种情况。
一、that引导定语从句，在从句中充当成分。
1. that在定语从句中作宾语时，往往可省略。如：
(1)John once talked to his mom about the cities (that) he had visited abroad。
在从句中that作visit的宾语，故可以省略。
(2)The homework (that )I finished last night was left at home。
在从句中that作finish的宾语，故可以省略。
2. that在定语从句中作主语时，不可省略。如：
(1) The teacher that is kind to us goes back home very late every day。
在从句中that作主语，故不可以省略。
(2) My old school that was located in the suburban was razed to the ground。
在从句中that作主语，故不可以省略。
3.that在引导限定性定语从句时，有时相当于in which, at which, for which或on which, 并且在从句中可以省略。如：
(1)Attitudes towards daydreaming are changing in much the same way (that ) (in which) attitudes towards night dreaming have changed。
(2)I like the music for the very reason (that ) (for which) he dislike it。
(3)We arrived the day (that ) (on which) they left。
二、that引导名词性从句时，充当连词，本身无实际意义。
1. that在引导宾语从句时，通常可省略。如：
We know (that) sound can travel through air。
that引导的从句在主句中充当know的宾语，故为宾语从句，此时that可以省略。
但：(1)在介词短语后的宾语从句中that常不可省略，且前面往往有个形式宾语it。如：
You may depend on it that they will support your plan。
See to it that you arrive at the railway station on time。
(2)两个宾语从句连用时，即使省略了第一个that，也不可省略第二个that。如：
I believe (that) you’ve done your best and that things will get better。
(3)在双宾语结构中，that从句充当直接宾语或是间接宾语时，不可以省略that。如：
He has told me that he will go to Shanghai tomorrow。
2. that引导主语从句、同位语从句及表语从句时，正规语中，通常不可省略。
(1)We heard the news that our team had won。
that引导同位语从句，that不可以省略。
(2)The fact is that we have lost the game。
that引导表语从句，that不可以省略。
(3)That you didn’t go to the party was a pity.
that引导主语从句，that不可以省略。
不过，如果it作形式主语，that从句放在句末，可以省略that。
(4)It was a pity (that) you didn’t go to the party。
三、that引导状语从句时，充当连词，有时也可省略。
1.在结果状语从句中，that有时可以省略。如：
The sound is so weak (that) you can’t hear it。
总之，that的省略现象在英语学习中很普遍，尤其是在定语从句和宾语从句中，大家遇到这两种句型时要多加留心that是如何使用的，注意总结。另外，如果大家对that省略的情况把握不好，建议大家在写作时最好不要省略that。
拓展阅读
一、时间状语从句中的省略
When (she was) very young, she began to learn to play the piano. 她很小时，就开始学习弹钢琴。
While (I was) at college, I began to know him, a strange but able student. 我在上大学时就开始认识他，一个奇怪但有能力的学生。
When arriving, send me a telegram. (When you arrive, send me a telegram.) 到达之后，来个电报。
Before leaving, turn off all the lights. (Before you leave, turn off all the lights.) 走之前，请关闭所有的灯。
Don’t come in until (you are) asked to. 不叫你请你不要进来。
Whenever (it is )possible, you should come and help. 不管什么时候只要有可能就来帮忙。
You should let us know the result as soon as(it is) possible. 你应尽快让我们知道结果。
注：as在引导时间状语从句时，没有这种省略现象。我们不可说As walking, she found a nice shining thing on the ground.
二、地点状语从句中的省略
地点状语从句的.省略常用下列结构：where(ver) possible, where(ver) necessary,
Lay these books where possible you can find them easily. 把这些书放在你可能容易找到的地方。
Put in articles wherever necessary in the following passages. 在下列文章中需要的地方填入冠词。
三、条件状语从句中的省略
常用的句型是：if necessary, if possible, if true, if anyone等。如：
Send the goods now if (they are) ready. 货物如果准备好了，请送过来。
He will come if (he is) asked. 如果叫他来，他就来。
If (it is) necessary, ring me at home. 如果有必要，朝我家里打电话。
Come along with me if (it is) possible. 如果有可能和我一起去吧。
If (it is) true, this will casue us a lot of trouble. 如果是真的，这会给我们带来很多麻烦。
There are few people nowadays, if (there are) any, who remember him. 很少有人能记起他。
You should stay where you are, unless (you are) asked to leave. 你应呆在你现在的地方不动，除非叫你动。
四、让步状语从句中的省略
He is a good man, though sometimes (he is) rather dull. 他真是个好人，尽管有时有点无聊。
Even if (I am ) invited to, I won’t go to such a bad lecture. 即使邀我去，我都不想听如此坏的报告。
五、比较状语从句中的省略
She can play the piano just as wonderfully as you (do). 她钢琴弹的我你弹的一样好。
She has finished the work earlier than (it has been ) expected.她完成得比预期要早。
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