We consider Tom to be one of the best students in our class. 1 X! C& z) H5 n; e3 T
我们认为汤姆是班上最好的学生之一。 ) D g% f! \2 |' |' M
典型例题 ; h! p$ D: t7 q/ S
Charles Babbage is generally considered ___ the first computer.
& H3 v2 R, z' a' U/ p8 {' F: R+ f% i6 s A. to invent B. inventing C. to have invented D. having invented
9 o" T( m) m- ^/ i, o8 g' [7 E3 A6 I 答案:A. 由consider to do sth. 排除B、D。. 此句只说明发明这一个事实,不定式后用原形即可。而C为现在完成时,发明为点动词一般不用完成时,且此处也不强调对现在的影响,因此不选C。 3 ^6 c7 V( g- p6 C# N; c7 g
3) to be +形容词 . |" t6 |/ o, Y, z
Seem, appear, be said, be supposed, be believed, be thought, be known, be reported, hope, wish, desire, want, plan, expect, mean… " H% B% L+ |9 M: Z. \6 h. N
The book is believed to be uninteresting.
0 S) x2 M. | k0 [ I2 v. S' v 人们认为这本书没什么意思。</p>0 K* ]7 v& R; U/ ~% G, t
4) there be+不定式 ! U& p, Z: {$ W: t' X* H3 n
believe, expect, intend, like, love, mean, prefer, want, wish, understand : I2 ?0 p, o2 B* g
We didn’t expect there to be so many people there.我们没料到会有那么多人在哪里。
" `, L8 ^" o9 d3 s* Z 注意 : 有些动词需用as 短语做补语,如regard, think believe, take, consider. / \& |9 F) H; Z( L
We regard Tom as our best teacher. 我们认为汤姆是我们最好的老师。 ' Q8 T) ]3 |( ^, k& d
Mary took him as her father . 玛丽把他当作自己的父亲。 V8 K' o+ c6 J# @+ ^5 @* k! t3 E
3 、不定式主语
% u ^- r& Q4 W5 y& d% L& D 1) It’s easy (for me) to do that.我做这事太容易了
& F2 g. i5 u. n7 b5 w3 ?% ~ _ easy, difficult, hard, important, possible, impossible, comfortable, necessary, better; the first, the next, the last, the best, too much, too little, not enough + u5 Q" R0 Q+ c# P$ _( j9 n- x6 Q
It’s so nice to hear your voice.
+ ]% M0 j( l8 W& g 听到你的声音真高兴。 2 @, j; V3 S g* V1 M
It’s necessary for you to lock the car when you do not use it. , U3 k; H" Q8 k- t7 i1 l/ k' I
当你不用车的时候,锁车是有必要的。
+ c6 G" ~# @* e8 z+ u 2) It’s very kind of you to help us. 他帮助我们,他真好。 * i$ y K' x7 O
Kind, nice, stupid, rude, clever, foolish, thoughtful, thoughtless, brave, considerate(考虑周到的), silly, selfish(自私的)
1 z9 n [ c- R4 T/ Z+ K$ C* F$ ` 例句:
, E* k8 ]. L4 M/ j. w. R* M It was silly of us to believe him. 我们真愚蠢,竟然相信了他。
. f2 H d8 t7 g, v4 E* p It seemed selfish of him not to give them anything. 他不给他们任何东西,这显得太自私了。 & U c. Z7 V9 {: |5 _0 u0 d
注意:1) 其他系动词如,look,appear等也可用于此句型
/ o7 q" p, h6 E4 `6 S 2) 不定式作为句子成分时,动词用单数形式。 / s0 ?3 y) s# X7 `" a
3) 当不定式作主语的句子中又有一个不定式作表语时,不能用It is… to…的句型 7 P6 u7 g7 r4 C' p+ r6 o
(对)To see is to believe. 百闻不如一见。
& ]! v+ f# v( J' s (错)It is to believe to see. . |, o, R: w' Q$ X. g/ o W
4 、It’s for sb.和 It’s of sb. 0 k0 x, E b$ f. E) l9 Z l0 u
1)for sb. 常用于表示事物的特征特点,表示客观形式的形容词,如easy, hard, difficult, interesting, impossible等:
2 j7 ] C' ]6 P k) J( s. L It’s very hard for him to study two languages. 对他来说学两门外语是很难的。
3 ]9 B" k( T# C; w- A4 J. X% W 2)of sb的句型一般用表示人物的性格,品德,表示主观感情或态度的形容词,如good, kind, nice, clever, foolish, right。 2 Q" b/ y4 W% x) F; x
It’s very nice of you to help me. 你来帮助我,你真是太好了。 for 与of 的辨别方法:
! K F* ^( \+ D/ w0 _% y 用介词后面的代词作主语,用介词前边的形容词作表语,造个句子。如果道理上通顺用of,不通则用for。如:
8 X- e. v; @8 {- y! {7 r You are nice. (通顺,所以应用of)。
4 g+ y! F" w+ L) H3 Z+ ] Y He is hard. (人是困难的,不通,因此应用for。) $ }) h/ w. k; K4 {1 O
5 、不定式作表语
% t- F+ k6 I) }- D6 I& v 不定式可放在be动词后面,形成表语。例如: ( q9 G# l" @5 H# f& ?
My work is to clean the room every day. |