单数句变为复数句在英语中，一个称为单数，两个或两个以上的称为复数，单数句变复数句有以下原则：四变，一去，一留。一、四变1．指示代词的变化：this和that分别变为these和those。如：Thisisapen.→Thesearepens.2．人称代词的变化：I变we,you还是you,he/she/it变they。如：Iamastudent.→Wearestudents.3．be动词的变化：am或is变为are。4．可数名词由单数变为复数，规则如下：①一般情况下词尾加s。如book—books②以s,x,ch,sh结尾的加es。如watch—watches③以o结尾的有生命力的加es,无生命力的加s。如photo—photos,tomato—tomatoes(西红柿)④以辅音字母加y结尾的，将y变i，再加es。如family—families⑤以f或fe结尾的，将f或fe变为v，再加es。•二、一去：即名词前不定冠词a/an要去掉。•如：Thisisaruler.→Thesearerulers.•三、一留：即原句中的形容词，定冠词the,副词，介词短语，名词所有格等保留不变。•如：ThisisTom'sjacket.→TheseareTom's◆写作案例假如你是Kate，下面有两张你的家庭照片，请根据照片写一段介绍，向你的同学介绍一下你的家人。____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________◆思路点拨1．可用的开头：①Hi!I'm...Ihaveabigfamily.②③Therearefivepeopleinmyfamily.2．教材中出现的主要句型：①Hereis/area/twophoto(s)ofmyfamily.②This/Thatismy...③These/Thosearemy...④Who'she/she?He/sheismy...⑤Who'rethey?Theyaremy...⑥My...is/areinthefirst/nextphoto.3．可用的结尾：①Ilovemyfamily.Wearehappy.②◆美文欣赏Hello!MynameisKate.Ihaveabigfamily.Therearefivepeopleinmyfamily.Herearetwophotosofmyfamily.Mygrandparentsareinthefirstphoto.Inthenextphotoaremyparentsandme.Thisismyfather,andthatismymother,thisgirlisme.Ilovemyfamily.
