(九)为了避免重复,不定式可省略,但to有时保留,有时不保留。例如:
+ B" _. x: o' W' s+ }* e You will make it if you try (to). 如果你努力,你会成功的。
! X8 X2 J7 G5 ?: E# b) O. t/ X George says he is going to leave Shanghai, but I don’t think he really wants to. George 说要离开上海,但是我不认为他真的愿意走。
9 b, B( k6 s4 C& ~) b5 b# X Some of them retired, and others were ready to. 一些人退休了,还有的准备退。 2 `% |6 ?6 { |5 u5 f7 {
He always speaks faster than he needs to. 他说话总是没必要的快。
- R$ ?% D' O9 k* e9 O I’d like to do it now, but I haven’t got the time (to).  我倒是想现在干,但没时间。 + Z+ h7 D. \3 t$ R/ f+ [' |
“Would you go there with me?” “I’m glad to.” “你愿意和我一起去吗?”“愿意。”
2 g0 {3 \; Z" @8 w “Did you pass the exam?” “No, I tried (to), but I failed.” “你考试及格了吗?”“没有,我努力了,但没成功。
1 ~* S$ |/ [, { x/ l2 V “Do you want to sing them an English song?” “I prefer not to.” “你愿意为他们唱首英文歌吗?”“我不想唱。”
( I9 o) r8 g \7 ?! D You’d better sing an English song if they ask you (to) again.如果他们再要求你,你最后唱一首英文歌。 5 m* f2 B/ N8 N& |3 ?: I2 F
后面常省略不定式而保留to的结构,还有:
7 q$ d3 |; e! s& N: Q1 W6 [5 r' M used to   常常 be going to 打算
& E b* i6 W: u' c5 l( ^ mean to  打算 ought to   应该 . R4 g0 j! b2 b7 ~9 t, x% I2 m/ r0 I
plan to 计划 want to     要想 1 F7 d2 m7 ?7 v/ V
(十)两个不定式由and, or, except, but, than 连接时,第二个可省略to,尤其是两个不定式紧密相连时。例如:
( Z, s7 I7 r# y) Q H: P I intend to call on him and discuss this question again. 我打算去拜访他并和他谈谈这个问题。 : M T4 t* X( d, u7 m: E: ^
I’d like to lie down and go to sleep. 我想躺下睡觉。
8 z: X( t8 M- z6 |$ F$ I$ r You’re free to talk or laugh here. 在这里你可以随便说笑。
# @" J B# v1 p1 }* N, q I’m anxious to go and ask him about it. 我急于去问问他这个事。 " N( \9 l: p* U. v& e) S9 e7 P
Do you want to have lunch now or wait till later?   你想现在吃午饭还是再等会儿?
0 d$ z- z! @) J; ?4 Q- p: w1 f We had nothing to do except (to) look at the posters outside the cinema. 我们无事可做,只有看看电影院外面的招贴。
- g& [" o' p6 N! @# c. @ He had nothing to do except talk nonsense.   除了胡说八道,他没别的事干。
' x& H+ |: L7 s) f" | I would rather die than be insulted. 我宁死也不受侮辱。 ' A3 ^% ^* L! x
I’ll do anything but work on a farm.   除了去农场干活,我什么都干。 5 n+ X* a& b2 o( v6 ?5 `
It’s easier to persuade people than (to) force them. 说服人容易,强迫人难。 8 _" X1 c; y+ e/ X. ?8 K
It’s better to take a taxi than (to) wait here. 搭出租车也比在这等强。
' Q3 p' v3 L. v6 [( i 句子中but后面的不定式带不带to,取决于but前面的句子里含不含do,只要有与do/did有关的词(do作谓语,to do作定语等等),but后面的不定式就省掉to。例如: ) H" G# k2 `2 ?1 o
I can do nothing but go there alone. 除了独自一个到那里去,我别无选择。
5 _% k; P7 U ~% E, k" r9 s I have nothing to do but go there alone. 除了独自一个到那里去我没事可干。
, ~- d- _6 H5 U4 {# l He did nothing but cry all day long. 他除了整天哭,什么也不干。
, Q, f$ U; w9 f3 \7 V Now let’s do some exercises: ) ^1 t2 |3 Y6 Q
1.用动词不定式结构完成下列句子: " Y- j; i6 v B0 o6 O C6 J
1)Let’s _______ (早回家). → go home early
1 |% \) B3 W0 W+ o" d; U4 z* q 2)I am going _____ (问问题). → to ask some questions ! x: E c' R: U$ @; G# \$ ?8 h
3)I’ve been hoping ______ (会见格林先生)ever since I left school → to see Mr. Green |