Unit3.Thisismysister. 　　句型：1,Isthisyoursister?No,itisn’t. 　　Issheyoursister?No,sheisn’t. 　　2,Thisismyfriend. 　　Thesearemyfriends. 　　Thatismybrother. 　　Thosearemybrothers. 　　3,Thanksforthephotoofyourfamily.Hereismyfamilyphoto. 　　photoofyourfamily=yourfamilyphoto 　　语法：可数名词单数变复数：一般情况下加s,book-books,以s,x,sh,ch结尾的加es 　　watch-watches以辅音字母加y结尾的,把y改为i再加esboy-boys,family-families以o结尾的有生命的加es,无生命的加s,tomato-tomatoes,photo-photos 　　Unit3Thisismysister. 　　一、短语 　　1.thanksfor(sth/doingsth) 　　2.penfriend/pal 　　3.familyphoto 　　4.takeaphoto 　　二、句型/语法点 　　1.Isheyourfriend? 　　2.This/Thatismysister. 　　These/Thosearemybrothers.