职称英语语法:第十二讲d
1) 前面讲到:"动词不定式"的完成式表示过去时,它常在以下句型中出现:
(主语)+ be said / reported / believed / supposed to have (been) done
(主语)+ seem to have (been) done
(主语)+ be likely to have (been) done
当考试时看到这样的句型出现,首先要考虑是否是"动词不定式"的完成式
2) 注意"动词不定式" to与介词to的区别,即:是to + 动词,还是to + 名词或动名词(-ing)。"第二讲 五个基本句型"中已经提到:object to / look forward to / be (get) accustomed (used) to / be subjected to / subject to / be subjected to / be opposed to / agree to等中的to是介词。
当考试时看到这样的表达方式出现,首先要考虑选择-ing形式(一般不会给纯名词形式)
关于on + ing 形式和with (without) + 分词独立主格结构
1)on + ing 形式:一般将介词on + -ing形式理解为"分词"(要有行为主体)而不是"动名词",意为 "当…时","一…就…",相当于when 或as soon as,例如:
On hearing the news, she burst into tears. (一听到这个消息,她一下子哭了起来。)
错:On arriving in Beijing, it began to rain heavily. (一到北京,就开始下起大雨来了。)
由于句子的主语it并不是arriving的行为主体,该句语法不成立。可以改为:
No sooner had we arrived in Beijing than it began to rain heavily.
2) with (without) + 分词独立主格结构
She fell asleep with the lamp burning. (她开着灯谁着了。)
Almost every day the kids returned home with their hands and faces covered with mud and sweat.(孩子们几乎每天回家时手上脸上都是泥和汗。)
当这样的独立主格结构中的动词为 "be" 动词时,往往省略,例如:
Every day the old teacher entered the classroom, with a poor bag under his arm. (每天,这位老教师夹着个破包走进教室。= with a poor bag being under his arm)
关于-ing和-ed形容词
当一个动词后面加上-ing或-ed就可以是一个形容词,其基本概念还是-ing为主动语态,-ed为被动语态,例如:a sleeping child (一个正在睡觉的孩子),a wounded soldier (一个受伤的战士) .
一些带有感情色彩的动词,由于人的感情是"被刺激"后产生的,故一般用-ed形式,而外界的刺激物则用-ing形式,例如:I was moved deeply; the film was really moving. (我深受感动;这部电影真是感人。)
the + 形容词(包括-ed形容词)→ 名词(可以是单数,也可以是复数), 例如:
the wounded (伤员)/ the disabled(残疾人)
关于现在分词和动名词
如前所述,现代语法并不强调现在分词和动名词的区别,建议学生"忘掉"动名词,特别是应试。但记住下面的规定:
She regrets ______ idle when (she was) young. (她后悔年轻时无所事事。)
A. to have been
B. her being
C. her having being
D. having been
解题思路:1)regret后一般接ing形式,除非regret to tell / say, 故A不能选;2)当动名词的逻辑主语与句子的主语一致时,不要再加逻辑主语了,故正确答案为D,比较:Tom insisted on my going with him. (Tom坚持要我和他一起去。)
非谓语动词讲了这么多内容,解题时始终不忘:
1) 分清过去、现在和将来;
2) 分清主动与被动;
3) 动词不定式的完成式表示过去时;
4) 见"for"要用完成式;
5) 否定式not要放在to / -ing / -ed的前面
只要记住以上要点,非谓语动词的解题就不会出大的问题