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1、第三节 动词非谓语形式动词不定式1.动词不定式作主语可使用it作形式主语 It takes dozens of seconds for a computer to solve this problem.It remains now to determine this coefficient.2.动词不定式作定语的几个句型 There are many problems for us to consider.第三节 动词非谓语形式动词不定式2.动词不定式作定语的几个句型(1)“介词+which+动词不定式”的形式 We have defined length and time units wit
2、h which to measure.We shall use such a field on which to base our discussion of magnetic properties.(2)the ability(tendency)of A to B 的形式 Energy is defined as the ability of a body to do work.The greater the tendency of an object to resist a change of velocity,the greater its inertia.第三节 动词非谓语形式动词不定
3、式3.其它几个句型(1)主语+系动词+形容词+不定式主动形式 This computer is easy to operate.(2)主语+及物动词+it+形容词+不定式短语 We find it very easy to solve this problem.(3)主语+及物动词+名词+形容词+不定式主动形式 We find this quantity difficult to measure.(4)名词性不定式 We have to find how large to make x so as for this inequality to hold.(5)不定式复合结构 For a tra
4、nsistor to function normally,it is necessary to apply proper voltages to its electrodes.第三节 动词非谓语形式分词1.作定语(一般遵循“单分在前，分短在后”的原则)These moving electrons form the current.In this case,the current flowing through a wire is directly proportional to the potential difference maintained.Distance is equal to s
5、peed multiplied by time.第三节 动词非谓语形式分词2.作状语 写作时侧重于在句首（主要表示时间、条件、原因及附加条件）和句尾（主要表示伴随状况、结果及方式）的情况，这是典型的书面语言形式 Having obtained the initial conditions,we go on to solve the network differential equations.Known as a“man-amplifier”,a machine under development consists of a framework that the operator wears.
6、Four node equations may be written based on an energy balance.Equation(5)may be solved using the Laplace transformation.第三节 动词非谓语形式分词3.分词独立结构 写作重点放在处于句尾时作附加说明（即伴随状态）用，这同样是典型的书面语言形式。The sign of the integral depends on the direction of the path taken,a counter-clockwise direction being taken as positi
7、ve.There are several basic laws governing these interactions,all of them discovered early in the nineteenth century.第三节 动词非谓语形式分词4.with结构(1)作状语。写作重点放在处于句首表示条件、时间和原因。句尾表示附加说明、方式和条件上。Both practical design techniques and theoretical problems are covered with emphasis on general concepts.All present sta
8、tes are stable with no inputs present.(2)作定语 The device with buttons on it is a keyboard.This is an inequality with zero on the right.第三节 动词非谓语形式动名词“by+动名词”意为“通过”“on(或upon)+动名词”意为“一就”,“在之后”“in+动名词”意为“在时候、”,“在过程中”By analyzing the performance of the device,one can appreciate it better.Upon substituting the actual magnitudes,v turned out to be the velocity.