电子信息工程专业英语课件21

第一节 词类—动词
• 2.半助动词的使用 半助动词(remain,seem,appear,happen)与 动词不定式合成谓词 This problem remains to be solved. These experiments seem to indicate that there are only two kinds of electric charge in the universe.
第一节 词类—副词
• 2.副词作状语时的位置
– (1)有些副词可放在句首 Usually some of these parameters are known. – (2)不及物动词与介词连用的情况下，副词往往放在介 词与动词之间 The device consists mainly of five parts. – (3)在“形容词+介词”(due to)的情况下副词往往插在 其中 This variation of ICQ with temperature is due primarily to variations in VBE.
第一节 词类—副词
• 2.副词作状语时的位置
– (4)在被动语态情况下，副词有几种情况 Computer have been widely used. This parameter can also be obtained from the vi characteristic. – (5)副词放在主动语态主动词前 We now introduce the usual symbols used in electric-circuit diagrams. This figure clearly shows the test points. – (6)副词放在宾语之后的情况 You must use these rules correctly. We can solve the equations simultaneously.
第一节 词类—动词
• 3.代动词(do ,does，did)的使用 科技写作中，代动词主要出现在比较状语 从句和方式状语从句中 Copper conducts electric current better than aluminum does. These radio waves behave as light waves do.
第一节 词类—副词
• 2.副词作状语时的位置
– (7)把副词放在及物动词后 We consider first some special cases. – (8)在祈使句中，有的副词放在动词之后，有的副词放在动词之前 Suppose next that the circuit consists of a capacitor. – (9)在系表结构中，一般副词放在is,are等连系动词之后，若有 will,can,may等词时，副词一般放在be之前 The reverse voltage gain is usually negligible. – (10)修饰不定式的副词一般可放在to 之后，也可放在动词或短语 后，有时还可放在to之前 It is necessary to decrease propagation delay time dramatically.
第一节 词类—副词
• 1.几类副词作后置定语的情况
– (1)地点副词 above,below,here,there,around,nearby,up,down作后置定 语 The table below lists resistivities of some substances. – (2)时间副词now,then,today,afterward作后置定语 The problem now is to determine the magnitude of the current. – (3)数量状语+某些ts 50 years ago could not do that.
第一节 词类—动词
• 1.特殊连系动词的使用 指由少数实义动词变成的连系动词，常见 的有get,turn,go,stay,appear,look,prove This graph looks puzzling. Its result proves correct. In this case, the output stays high.