犯罪活动下载:The professor unwrapped the parcel and saw that it contained two sandwiches and a hard-bioled egg

这是一个并列句
包含两个或两个以上主谓结构的句子叫并列句，句与句之间通常用并列连词或分号来连接，此句可分二句:
The professor unwrapped the parcel .教授打开了包.
The professor saw that it contained two sandwiches and a hard-bioled egg .教授看到里面竟是两个三明治和一个熟鸡蛋 .(第二句可省略主语The professor用and 连接)

二个动作差不多同时发生可用并列句表达,第二句可省略主语,用连词或分号来连接.这里不能用that连接,that连接一般是主从关系.

hard-bioled 可能你打字有错:煮熟的鸡蛋是:hard-boiled egg .

and连接两个并列的动作
unwrapped是unwrap的过去时形式
saw是see的过去时形式
that是个先行词，这里引导一个宾语从句，可有可无，但是不能换成，
hard-bioled是煮熟了的

that可以引导名词性从句、定语从句,其具体用法如下：

一、that引导名词性从句时(即主语从句、宾语从句、表语从句、同位语从句),在从句中无具体含义,只起连接作用,而且在从句中也不作任何句子成分。它所引导的从句的句子结构和意义是完整的,而且从句一般是陈述一个事实。
例如:
①That she was able to come made us very happy.
她能来使我们很高兴。
②The news that our team has won the match is true.
我们队赢了这场比赛的消息是真的。
③The reason he didn't come was that he was ill.
他没来的原因是他病了。

当that引导的主语从句或宾语从句太长时,常用it作形式主语或宾语而把that从句放在后面。如:

①It is well—known that the earth is round.
众所周知,地球是圆的。
②We find it necessary that we practise spoken English every day.
我们发现每天练习英语口语很有必要。

注意：
that引导的主语从句,表语从句以及同位语中,that不能省略。that引导的宾语从句,一般可以省去that,但在下面情况中不能省略——
1.在suggest, order等表示命令、请求、建议等动词后的宾语从句中,不能省；
2.由and或but所连接的两个引导的宾语从句时,第一个从句中的that可以省,第二个从句中的that不能省；
3.that引导的宾语从句,如果从句中还有其他状语从句,引导宾语从句的that不能省略。
Tell him that if he is at home, I'll call to see him.

二,that引导定语从句要注意以下几点:
1.定语从句中缺主语,修饰人时用who /that,修饰物时用which /that引导.如:
Is this the factory which /that makes TV sets
The man who /that visited our school is from Australia.
2.从句中缺宾语,修饰人时用 who /whom /that或省略引导词;修饰物时用which /that或省略引导词.如:
Gone are the days which /that we spent together in the village.
He is the man who /whom /that I think to be worthy of our praise.
3.用that不用which的七种情况:
①先行词前有形容词最高级或序数词修饰时,用 that不用which引导.如:
This is the best place that I have ever visited.
②先行词为little,much,all,none,few,(the)one, something,everything,nothing,anything等不定代词时,用that引导.如:
There is nothing in the world that can frighten him.
③先行词既有指人的名词又有指物的名词时,用 that引导.如:
He told us about the people and the cities that he had visited.
④先行词前有any,all,no,few,every,some,little, much,(the)very,(the)only,(the)last等词修饰时,用 that引导.如:
This is the very coat that I need.
⑤先行词为which时,为了避免重复,用that引导.如:
Which is the book that you bought yesterday
⑥先行词在从句中作表语时,常用that引导.如:
Shanghai is no longer the city that it used to be in the 1930's.
⑦当主句是There be...句型时,用that引导.
There are two tickets for the film that are for you two.
看下面句子,能说出句中各个that的用法吗 That teacher said that that that that that boy used in that sentence was not correct. That在英语中是一个使用频率很高的词.它可用作代词,副词,形容词,连词,关系代词等,在句中可作主语,宾语,定语,状语或起联结作用等.下面就that的主要用法作一些归纳,以供同学们复习时参考.
that用作指示代词,指代某人或某物,或指上文提到的人或事物(单数名词)."那个"
This is Mary and that is Jack.
That is your coat.
Few pleasures can equal that of a cool drink on a hot day.
Is that why you had a few days off
Who is that Is that you (电话用语)
that用作形容词限定单数名词,"那个,那",或作副词修饴形容词或副词,表程度."那么"
That day I met an old friend of mine in the street.
That bike of yours is broken.
I can't walk that far.
The weather is not that cold.
三,引导从句的that.
与有关词构成短语,如 so that(以便,以致),so...that(如此…以致),such…that(如此…以致),in order that(以便),for fear that(以免),on condition that (假设),now that(既然),in that(因为)等,引导的状语从句,且that不可省.
They started so early that they might arrive in time.
It is such a heavy box that nobody can move it.
John shut everybody out of the kitchen so that he could prepare his grad surprise for the party.
He worked hard in order that he might catch up with the others.
Now that you have got a chance, you might as well make full use of it.
Advertising is different from other forms of communication in that the advertiser pays for the message to be delivered.
二)that用作从属连词,引导名词性从句,且在从句中没有意义,也不充当成份,引导宾语从句时有时可以省略,但引导主语从句,表语从句和同位语从句时一般不省略.要注意从句的位置.
That he came late made his teacher angry.(主从)
That you don't like him is none of my business. (主从)
有时用it作形式主语,把从句置于谓语动词之后时,that可以省略.例如:
It is a pity(that) he has made such a mistake. (主从)
It worried her a little that her hair was turning gray. (主从)
My suggestion is that we should start early tomorrow.(表从)
My idea is that we should get more comrades to do t he work. (表从)
I'm afraid (that) you don't understand what you said.(宾从)
I don't believe( that )they have finished their work yet. (宾从)
He has made it clear that he will not give in. (宾从, 且that不可省)
I know nothing about him except that he is from the south. (宾从, 且that不可省)
Everybody could see what happened and that Tom was frightened. (宾从, 且that不可省)
The news that our team has won the match is true.(同位从句)
Word came that some American guests will come for a visit to our collage. (同位从句)
Information has been put forward that more middle school graduates will be admitted into universities. (同位从句)
三),that用作关系代词,引导限制性定语从句,替代其前面的先行词,充当从句的主语和宾语,其先行词既可是人也可是物.
当它作从句的主语时,that不可省.但如作从句的宾语时,that可省略
All that is needed is a supply of oil.
They talked of things and persons that they remembered.
Finally, the thief handed everything (that) he had stolen to the police.
I like the way( that) you speak to her.
All of the flowers now raised here have developed from those that once grew in the forest.
四,用在强调句型 It is/was...that结构中,替代被强调部分,没有意义,但that不可省.
Was it you that I saw last night at the concert
It is the ability to do the job that matters not where you come from or what you are.
It was about 600 years ago that the first clock with a face and an hour hand was made.
Was it in 1969 that the American astronaut succeeded in landing on the moon
五,含有that的常用短语和惯用语.
That is to say (作插入语)那就是说,即
That's all right.(回答致谢或致歉)不必谢,没关系.
That's it.对了,就这样.
That will do/That'll do.够了,行了.
That rings the bell.答对了.
Upon that 于是,立刻 如,Upon that they left.
So that's that. 就这样决定了.
That's all.(讲话结束语)完了.
That's great!太好了,好极了.
现在明白了开头那个句子中五个that的意义了吧.

saw: see 的过去时. that 引起宾语从句。口语里可省去这个that.