(4) It was wrong for Mr Lim to suddenly quit the job.

(5) It was wrong for Mr Lim suddenly to quit the job.

(6) Is it possible for a chaotic country to further develop its economy?

(7) Is it possible for a chaotic country to develop its economy further?

由于不定式动词的两部分在适当时分开有其优点，这种用法，在现代英语里越来越普遍。例如：

(8) Civil servants were urged to better serve the public.

(9)The Economic Development Board has just announced some new plans to further promote the economic development.

(10) I don't want you to be forever criticising your friends' good efforts.

(11) The new manager wanted the new scheme to be properly implemented.

最后，顺便谈谈什么情况下，不定式动词中的“to”要省略。

一、和“make, let”, 及感官动词“see, hear, watch”连用的句型中，“to”必须省略。例如：

(12) Don't make her cry.

(13) I won't let you go now.

(14) We saw a man jump into the lake.

(15) Have you heard me call you ?

(16) Let us go to watch him play the game.

二、在“had better, would rather”后面的不定式动词中的 “to”要省略。例如：

(17) You had better do the work now.

(18) It is late now. I would rather go tomorrow.

要注意的是，在被动语态中“to”这符号可能要重现。例如：

(19) Noone can make him understand the real problem. → He cannot be made to understand the real problem.

(20) We heard them speak English.→They were heard to speak English.