动词不定式（3）.

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1 动词不定式（3）

2 3、作宾语 We wish(想要) to find(求出) the resultant(合力) of these two forces(力). （1）注意其被动形式 These problems(问题) deserve(值得) to be further(进一步) studied. （2）一个常用句型（采用形式宾语“it”） “主-谓-it-宾补-不定式（宾语）” We find(发现) it very difficult(困难的) to solve(解) this differential(微分的) equation(方程).

3 We consider(认为) it necessary(必须的) to make measurements(测量) with accuracy(精确).
4、作表语（在系动词[一般只用“is(是)”或 “will/should/can be”]后面，这时主语必定为抽象名词）。 （1）其特点是： i. 主表含义相等 ii. 它只能是主动形式 One effect(效应) of a force(力) is to change the state(状态) of motion(运动) of a body(物体).

4 The next step(步) should be to replace(代替) the parallel(并联的) resistances(电阻) with a single(单一的) equivalent(等效的) resistance. ※注意下面句中不定式并不作表语，而是表示“将要；打算；必须；应该”等含义： We are to discuss(讨论) this point(点) in the next chapter(章). This milliammeter(毫安表) is to be used as an ammeter(安培表).

5 思考题: 英译汉(综合) 1. We are not concerned(关心) with Q-point changes with β variation(变动) due to(由于) transistor(晶体管) replacement(更换). 2. It is desired(想要) in this chapter(章) to treat(论述) transmission(传输) lines(线) with the attention(注意) they deserve(应得). 3. When a problem is to be solved(解) by a computer, one may use a flowchart(流图).

6 4. The intensity(强度) of this probe(探测) signal(信号) is small enough so as not to perturb(扰乱) the system appreciably(明显地). 5. It will not be necessary(必须的) to calculate(计算) the component(分量) of the velocity perpendicular to(垂直于) the magnetic(磁的) field(场).