七年级上册英语二单元知识点：七年级英语2单元知识
七年级上册英语二单元知识点：七年级英语2单元知识3.-Who are these/those? 复数 -He/She is my mom/my dad/my brother/my sister/my grandma/grandpa……1.-This/That is my sister/brother/father/mother/son/…… 单数 -These/those are my sisters/brothers/…… 复数2.-Who is he/she ? 单数
Unit 2 This is my sister
重点单词
Sister mother father parent brother grandfather grandmother grandparent family those who these hey well have day bye son cousin grandpa mom aunt grandma uncle dad here daughter photo of next picture girl dog
重点句型
1.-This/That is my sister/brother/father/mother/son/…… 单数
-These/those are my sisters/brothers/…… 复数
2.-Who is he/she ? 单数
-He/She is my mom/my dad/my brother/my sister/my grandma/grandpa……
3.-Who are these/those? 复数
-They are my my sisters/brothers/……
4.-Is he/she your sister? 单数
-Yes he/she is. /No he/she isn’t.
5.-Are these/those your sisters? 复数
-Yes they are. / No they aren’t.
6.Tom: Jhon this is my sister Mike. Mike this is my friend.
Jhon: Nice to meet you!
Mike: Nice to meet you too.
语法
一、指示代词：this that these those
单数：this: “这个，这”指近处或距离说话人较近的人或物。
that: “那个，那”指远处或距离说话人较远的人或物。
复数：these: “这些”指近处或距离说话人较近的人或物。
those: “那些”指远处或距离说话人较远的人或物。
二、将单数形式的句子变为复数形式的句子
1.指示代词的变化：this→these that→those
2.人称代词的变化：I→we; you不变；he/she/it→they
3.be动词的变化：am/is→are
4.可数名词的变化：
单数变复数的规则变化
(1)一般情况下在词尾加-s；
(2)以s x sh ch结尾的加-es；
(3)以o结尾的加-s或-es;
-s: photos/radios/pianos/zoos/bamboos/kilos
-es: tomatoes/potatoes/……
(4)以f或fe结尾的变f/fe→v es （屋顶roofs 信念beliefs 首领chiefs除外。）
knife→knives shelf→shelves
(5)以“辅音字母 y”结尾的变y→i es
不规则变化：
(1)单复数同形：sheep绵羊，deer鹿，means手段
(2)变元音：man→men foot→feet tooth→teeth
(3)变词尾：child→children ox→oxen mouse→mice
(4)只有复数的名词：congratulations clothes glasses surroundings goods shorts thanks trousers wishes
(5)单复数意思不一致：glass玻璃，glasses眼镜；water水，waters水域；people人民，peoples民族；force力量，forces部队；arm胳膊，arms武器；……
三、人称代词的用法：he she it I they we you
1 与be动词的搭配：I→am he/she/it→is you/we/they→are
2 独立作主语时习惯用宾格：me，you，him，her，it，us，you，them
-I like bananas.-Me too.
3 并列作主语的顺序：
单数：你you 她she/他he 我I 二三一
复数：我们we 你们you 他们they 一二三
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