Unit 2This is my sister.第三课时Section A(Grammar Focus3c)单元语法精讲一、指示代词表示“这个”，“那个”，“这些”，“那些”等指示概念的代词叫指示代词。1this，these是近指，一般用来指时间或空间上较近的事物；that，those是远指，常用来指时间或空间上较远的事物。this，that指代单数，these，those指代复数。eg：Is this your pencil？这是你的铅笔吗？These are my friends.这些是我的朋友。Is that his book？那是他的书吗？Those are my brothers.那些是我的兄弟们。2回答this/that，these/those作主语的问句时，常用it和they分别代替this/that和these/those。eg：Are these/those your English books？这些/那些是你的英语书吗？Yes，they are.是的，它们是的。Whats this/that？这/那是什么？Its a ruler.它是一把尺子。3介绍在一起的人或物时，先说this/these，后说that/those。【注意】this is，these are，those are都不能缩写，而that is可以缩写成thats。二、who的用法主要用来询问某人是谁，常用来引导特殊疑问句。eg：Whos she？Whos he？Whore they?这些都是由who引导的特殊疑问句。who是特殊疑问词，意为“谁”。基本句型为：Whois/are主语(人)？意为“是谁？”回答常用He/She is/They are eg：Whore they？他们是谁？They are Tom and Jim.他们是汤姆和吉姆。Whos he？他是谁？He is Dale.他是戴尔。另外，who可与is，are缩写，who iswhos，who arewhore。单元语法强化训练一、单项选择。1.This is my _，and these my _Asister，parentsBbrother，parentCbrothers，sisters Dparents，brother2Are _ your friends?Yes，_ are.Athese，these Bthese，theyCthis，they Dthose，these3David，_ is my brother，Tom.AitBthis CthoseDtheseABB4This _ my sister and those _ my friends.Ais，are Bare，isCare，are Dis，is5_ are his parents.AThatBTheseCThisDItA B 二、按要求完成句子。6This is my brother.(改为复数形式)_my _7Shes my_sister(对画线部分提问)_she?8Theyre my_grandparents(对画线部分提问)_they?9Are those your parents？(作否定回答)No，_10Those are oranges.(改为单数形式)_orange.These are brothersWhosWho are they arentThats an Are those grandparentsWhoreTheyre三、根据汉语完成句子。11那些是你的祖父母吗？_your_?12这些是谁？他们是我的朋友。_these?_my _13她是谁？她是我姐姐。_?_my sister.14这些是我的姐姐，那些是我的哥哥。_my sisters，_ are my brothers.friendsWhos sheShesThese are those