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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