西电专业英语阅读课件3 non-finite verbs.ppt

I. The infinitive As the subject: It is necessary/possible/a simple matter to do sth. 我们必须掌握好牛顿定律。 我们完全可以解这个方程。 It proves convenient to do sth. It helps/works/suffices to do sth. It takes sb. st. to do sth./It does sb. good to do sth. It +passive voice+ to do sth. Translation 证明这个公式成立就留作习题。 It is left as a problem to show that this equation holds. 我们需要解方程求未知量。 It is desired to solve the equation for the unknown. As the object Its passive form 这一问题值得研究。 This problem deserves to be researched. S-V-it-O.C.-to do We find it very difficulty to solve this type of differential equation. (微分方程) As the predicative When the subject is “task/duty/purpose/objective/ goal” As the adverbial Mainly expressing purpose 为此 我们做了许多实验来检验这一理论。 Complex infinitive In order for the block（木块） to slide at constant speed, the net force（净力）in the direction of sliding must be zero.(“为了使…[能够]…”) For there to be life, there must be air and water. For … to do 为了使…能够… 译： 为了使晶体管（能够）正常工作，必须给其电极electrode加上合适的电压。 As the attribute Expressing 将，将要 R是所要测定的电阻。 When the noun is modified by an ordinal number 第一个使用这个方法的人 Special case when the infinitive phase is used as an attribute Will you please give me a pen to write with? Each member has a switch with which to indicate a Yes or No vote. 译 有许多种类型的万用表multimeter可供选用。 There are many types of multi-meters to choose from. 这山谷用作为建坝的基础. This valley is used as the foundation to build a dam on. The reflexive infinitive（反射式不定式） This concept is very easy _________ (understand). We find this theory difficult _________ (explain). Translation 操作系统应该易于设计，实现和维护。 The operating system should be easy to design, implement, and maintain. Mistake correction Small houses are more comfortable to live. I wish to thank the team members for their assistance throughout and for being so easy to work. Some set phrases The ability/capacity of … to do… The tendency of… to do… The desire of… to do… 译：有好几个因素影响电容器储存电荷的能力。