人 称 代 词
一、主格人称代词有I， we， you， he， she， they， it，主格人称代词就是在句中充当主语和表语的代词
二、宾格人称代词有me， us， you， him， her， them， it，宾格人称代词即在句中充当宾语(含介词宾语)的代词
三、同步练习
1) Archibald Motley's artistic talent [A] was apparent [B] by the time him [C] enrolled [D] in high school.
2) Legends often contain an element [A] of fact， but [B] sometimes it is [C] totally [D] untrue.
3) Unlike [A] road vehicles， Hovercrafts have no physical [B] contact with the surface over which [C] them [D] travel.
4) Let you and I [A] promise that we shall always [B] dare to do [C] what is [D] right.
5) Most of we [A] know that conductors direct their orchestras with a baton， but how many [B] are aware that [C] they also direct with their faces， hands [D] ， and shoulders?
四、例题解析
1) C错。him是宾格，而此处却需要作主语的人称代词，故应将him改为主格he.
2) C错。 改为they are.C处代替的是“Legends”而不是“an element”。
3) D错。them也是宾格，应改用主格they，作定语从句中的主语，谓语为travel.
4) A错。 改为me.
5) A错。改为宾格us，因为前面是介词of，us作其宾语，故用宾格。
物 主 代 词
一、表示人的物主代词用my， our， your， his， her和their，指无生命的东西用its(但指国家时一般用she或her)，它们在句中作定语
二、名词型物主代词能作表语(It's theirs)、主语(Mine is there)、宾语(I don't like hers)，与of连用可以作定语(the food of theirs)。
三、同步练习
1) A scientist bases its [A] work on hypotheses that [B] have been checked [C] through careful [D] experimentation.
2) Crude rubber is an [A] elastic(有弹性的) solid with a specific gravity of 0.911 and a refractive index(折射率) of 1.591， though it [B] composition varies with different latexes(橡浆) as well as [C] with the way it is prepared [D] at the plantation.
3) Manufacturers [A] of consumer goods [B] often change [C] the styles of them [D] products.
四、例题解析
1) A错。 改为his.
2) B错。 改为its.
3) D错。 改为their.
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