My mum is reading a book；isIS 有什么用？

My mum is reading a book；isIS 有什么用？ My mum was cooking,_____I was reading a book.用什么词?when还是as?为什么? This is a birthday present from my mum. My mum is a nurse.(改特殊疑问句） my mum is a doctor用什么提问 a,Jack,letter,is,friend,reading,from,his,his,mum,to（.）连词成句 a jack litter is friend reading from his mum to连词成句是句号 请帮忙改篇作文Books-My Best TeachersMy people like to read books; me too,books are my best teachers.My mum is the one who has developed my interest in stories.Since I was a infant,mum been reading to me stories about Snow White,Alice in Wonder (a book / the boy / there / reading / over )is my brother No.My father is reading a newspaper的问句 My father is reading a magazing in the study.改错 My father ____ a magazine nowA.read B.is reading My sister is reading a book.就划线部分提问reading a book是画线部分 对My sister is reading a newspaper in the library中的reading a newspaper提问 填单词和连词成句填单词；1.（ ） （ ）is Tom lucy He is( )the classroom?2.()is he doing?he is reading 3.is jack()home?no he isn't.4.()is my coat,mum 5.where is your sister?( )is in the bedroom.6.we have a meeting( )6:00 连词成句:1. Mum,where is my coat的意思 改错“Mum,where is my football socks?” 1.Mum,_____(these) is my friend