狀語
非謂語動(dòng)詞做狀語是這一講的重點(diǎn)，也是考試的重點(diǎn)。大家還記得"句子的連接"一講中說過的"逗號(hào)不能連接兩個(gè)句子"這句話和所舉的例子嗎?
錯(cuò)：He is ill, he cannot come to the party this evening.(逗號(hào)不能連接兩個(gè)句子)
對(duì)：Because he is ill, he cannot come to the party this evening.(使用連接詞)
對(duì)：Being ill, he cannot come to the party this evening.(使用非謂語動(dòng)詞形式)
如果：His child is ill, he cannot come to the party this evening. 該怎么改呢?
道理是一樣的：
His child being ill, he cannot come to the party this evening.
也就是說，非謂語動(dòng)詞也要有"行為的主體"，稱為"主格";如果"非謂語動(dòng)詞的行為的主體"與句子的主語不一致，要保留其行為主體(如上句中的"his child")，這種結(jié)構(gòu)稱為"(分詞)獨(dú)立主格結(jié)構(gòu)".
那么，什么情況用"to do" 、"-ing" 或 "-ed "呢?注意以下兩點(diǎn)：
(1) 要符合下表的基本要求。
|
|
to do |
-ing |
-ed | ||
|
主動(dòng) |
被動(dòng) |
主動(dòng) |
被動(dòng) |
被動(dòng) | |
|
將來時(shí) |
to do |
to be done |
|
|
|
|
現(xiàn)在時(shí) |
|
|
doing （sth.) |
being done |
|
|
過去時(shí) |
to have done |
to have been done |
|
|
-ed |
(2) 要注意以下基本用法和思路
前置(即放在句子的前面)：
|
形式 |
功能 |
辨別要點(diǎn) |
|
To （或In order to) do sth., + 句子 |
目的："為了…" |
1) 與句子間有"，"隔開； |
|
-ing /-ed ，+ 句子 |
1) 時(shí)間狀語："當(dāng)…時(shí)候" |
1) 與句子間一般有"，"隔開； |
顯然，"to do"做狀語形式和意義比較單一，難點(diǎn)是如何區(qū)分-ing 和-ed 形式。
下面每個(gè)例子說明一條規(guī)則，注意理解和記憶(重點(diǎn)不要去區(qū)分作什么狀語，也不要刻意去翻譯句子的意思，重點(diǎn)注意形式的轉(zhuǎn)換和規(guī)律)：
1) When she heard the noise, she went out to see what was happening.
Hearing the noise, she went out to see what was happening.
規(guī)則：當(dāng)句子的主語(she)與 (非謂語)動(dòng)詞構(gòu)成主動(dòng)語態(tài)時(shí)，只要將實(shí)義動(dòng)詞(heard)恢復(fù)原形 (hear)，后面加ing即可
2) When (或 If) the substance is heated to over 200℃, it will give off a poisonous gas.
Heated to 200 over 200℃, it (= the substance) will give off a poisonous gas.
規(guī)則：當(dāng)句子的主語(it = the substance)與 (非謂語) 動(dòng)詞構(gòu)成被動(dòng)語態(tài)時(shí)，去掉be動(dòng)詞，只保留動(dòng)詞的-ed形式(heated)即可
3) As he did not want to hurt her feelings, he did not tell the truth at the moment.
Not wanting to hurt her feelings, he did not tell the truth at the moment
規(guī)則：非謂語動(dòng)詞的否定式是在非謂語動(dòng)詞前面(不是后面)加not構(gòu)成;其他變化按照例1)或例2)規(guī)定
4) As she has lived in China for over 20 years, she can speak Chinese fluently.
Having lived in China for over 20 years, she can speak Chinese fluently.
As they had not finished the lessons, the students had to give up going to see the play.
Not having finished the lessons, the students had to give up going to see the play.
規(guī)則：當(dāng)句子中出現(xiàn)1)"for + 時(shí)間"狀語，或2)當(dāng)一個(gè)行為必須在另一個(gè)行為結(jié)束后才能開始的情況下，應(yīng)該用"完成式"，否定詞 "not" 要放在"having"的前面，即"Not having…"
提示：當(dāng)你在考試時(shí)分不清是否要用"完成式"時(shí)，應(yīng)傾向于選擇有"完成式"的選項(xiàng)。
5) If weather permits, we'll go out for a picnic tomorrow.
Weather permitting, we'll go out for a picnic tomorrow.
When all necessary data had been collected, they began the experiment.
All necessary data having been collected, they began the experiment.
(注：這個(gè)句子也可以寫成：All necessary data collected, they began the experiment.考試時(shí)按例4)提示選題)
規(guī)則：當(dāng)句子的主語與非謂語動(dòng)詞的主格不一致時(shí)，應(yīng)使用"獨(dú)立主格形式"，其他變化按上述各項(xiàng)規(guī)定處理
后置(即放在句子的后面)：
|
形式 |
功能 |
辨別要點(diǎn) |
|
句子 + to do sth |
1) 目的："為了…" |
要特別注意以下結(jié)構(gòu)： |
|
-ing /-ed ，+ 句子 |
1) 說明、伴隨或方式 |
分詞做"后置"狀語的多數(shù)為"-ing"形式，很少是"-ed" |
需要說明的是醫(yī)學(xué)全在.線.提供, m.bhskgw.cn：
1. 所謂"前置"和"后置"是相對(duì)的，這里這樣區(qū)分一是為了便于理解，二是根據(jù)職稱考試中出題的習(xí)慣，便于判題;
2. 關(guān)于功能，這里只是講了考試中較多出現(xiàn)的形式和結(jié)構(gòu)，對(duì)于諸如如何區(qū)分"目的"和"結(jié)果"等內(nèi)容，因與解題關(guān)系不大，這里就不作具體說明了。
