第一個(gè)維度:與主句的粘合度
各種從句,與主句的密切程度叫做粘合度;一般來說,粘合度最高的是名詞從句,它們直接在主句里充當(dāng)成分,是一種你中有我的關(guān)系,如:
Whether he will be here is unknown. 從句充當(dāng)主語,即主語從句;
I believe that he did not lie. 從句充當(dāng)賓語,即賓語從句;
The truth is that we never sent the letter to him. 從句充當(dāng)表語,表語從句;
He told us the news that Hawking passed away. 從句充當(dāng)同位語,同位語從句;
與主句的粘合度稍微淡一點(diǎn)的,是定語從句;限制性定語從句還鑲嵌在主句中,如:
The girl who came back from USA is our monitor.
I lost the phone which my father bought back from Europe for me last month.
雖然定語從句修飾的名詞在主句中所處的成分不同,但畢竟都還嵌套在一個(gè)句子里。但是,比起名詞從句直接充當(dāng)主句成分來說,還是不夠純粹,粘合度嘛,自然就要低一些啦。這就是限制性的定語從句。
而非限制性定語從句,粘合度就更低啦,跟主句有一個(gè)逗號的距離,基本上跟主句是漸行漸遠(yuǎn)的了,如,
He never told us the truth, which made the whole case complicated.
We have to open the window, as everybody need fresh air in.
Peter drives fast, which is dangerous.
其實(shí),從句子的意義上來看,非限制性定語從句,已經(jīng)是一種修飾句子的狀語從句啦。
與主句的粘合度最低的是狀語從句,不論與主句之間有沒有個(gè)逗號隔開,其意義都是獨(dú)立的兩個(gè)句子,雖然對前一個(gè)句子有修飾的作用:
When I came back he was sleeping.
He never goes to school, because his mother teaches him everything at home.
If you do not put down the gun, I will kill her.
這樣,我們就總結(jié)出來,粘合度最高的是名詞從句,中間的是定語從句,而最低的就是狀語從句。你會了嗎?
第二個(gè)維度:各從句的樣子維度,也就是各種從句的構(gòu)成
我們先來看名詞從句,名詞從句分四種,主語從句,賓語從句,表語從句和同位語從句;每種從句都有三種構(gòu)成方法:
第一種 陳述句 用一個(gè)固定的引導(dǎo)詞 that, 萬萬不能省略!
That he loves iPhone is a truth.
I believe that he loves iPhone.
The truth is that he loves iPhone.
His father gave him a gift, an iPhone.
第二種 一般疑問句 在兩個(gè)之中選一個(gè)來做從句的引導(dǎo)詞,if / whether
Whether he loves iPhone is unknown.
I don’t know if he loves iPhone.
The problem is if he loves iPhone.
They asked us a question, if he loves iPhone?
第三種 特殊疑問句 用特殊疑問句中自帶的疑問詞作引導(dǎo)詞
What he likes is unknown.
I don’t know where he is from.
The problem is when we will come back.
They asked us a question, how we can get there?
名詞從句很龐大,不僅種類有四種之多,而且除了陳述句,還可以用一般疑問句和特殊疑問句來充當(dāng);其它剩下兩類從句定語從句和狀語從句就沒有這么多花樣,它們分別只有一種從句,而且只能用陳述句來充當(dāng);
定語從句 一定有一個(gè)先行詞,而且只可以用陳述句來充當(dāng);
The girl who speaks fluent English is my elder sister.
He lost the iPhone which his father bought back from USA for him.
狀語從句 標(biāo)桿就是各種特征鮮明的引導(dǎo)詞,也只能用陳述句來充當(dāng);
Although he was young, he knew many secrets.
We have to cancel the meeting, because it rained cats and dogs.
He worked hard so that he would attend TOEFL test at the end of this year.
從與主句的粘合度與長相兩個(gè)維度,你會區(qū)分三大從句了嗎?
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