二、代词的单复数 him,her--> them, 注意一下
三、代词的性别
his/her himself/herself
四、代词的人与物
Although he is employed in hte scientific field, the metric system is not us
ed in the U.S.
~~->it
五、关系代词
┏ which 指代物
┃ that 指代人或物 注意:who与which混用
┗ who 指代人
┏ who 主
┃ whom 宾
┗ whose 所有格
whom image --->只考过一回
~~~~->whose
*主要考who和whose的混用
who + noun. 错 whose + V 错
that 作关系代词在句子中充当成分,作副词时不做成分
介词
一、through/throughout
through: “穿过”、“通过”,强调动作
通过某种方式:through x-ray analyse
throughout: “贯穿”throughout his lifetime
“遍布”throughout the world
二、between/among
between the stars/trees 两两之间
among the two realms 错
三、in/inside /into
inside,in 静态,强调状态
into 动态,强调动作
air inside the house
shoot...into the sky
in + 单数noun.(无冠词),表示某一领域,某一方面,某一行业
in shape, in size
四、in/for/since
in + 1. 时刻点
2. 一段时间 in recent years(完成时态) in two days(将来时态)
for+ 1. prep. + 一段时间 for three years 可用于过去时,完成时
2. conj. 并列连词,不能位于句首 “因为”,引导原因状语从句
句子,for 句子
since+1. prep., “自从”+时刻点,完成时
2. conj., “因为”Since +句子,句子,引导原因状语从句
3. adv., a. 与过去时共用 = ago
...was...many years since ...
b. 与完成时连用,表示过去某个时间某个事件到现在
Tom was elected president last term, but he has since de
voted
little for his spare time to his responsibility.