Bob is (a) eleven-year-old boy.为什么用a不用an?

Bob is (a) eleven-year-old boy.为什么用a不用an? 同义句转换,没空一词 Bob is eleven years old.Bob is ( ) ( ) boy. he said mother the boy is elevon ye ars old he ( )his mother the boy( )eleven years old I think -- is very easy.A lesson Eleven B Eleventh lesson C the Eleven lesson D Eleven Lesson This is my family （）This boy is me .（）is Bob .I am eleven.I am in No.8 Middle School.This is my father .() name is Jack Smith .He is a teacher in my school .He is() English teacher .And this is my mother,she is a (),too.()that man next to my Bob is a ( )star in our school. is bob a boy?做否定回答 who is that?A.That's a student B.It's Bob C .This is Bob This book is Bob's.That book is John.These books are_____.如题,A.Bob's and John'sB.Bob's and JohnC.Bob and John's Aother way of saying eleven forty is __.A、twenty to twenty B、twenty to twelve C、twenty to eleven D、eleven past forty when is ( )birthday A,bod father B,bob's father C,bob's father's D,bob father's . Bob is a boy.Her pen is here.(单句改错) 根据短文回答问题(详细点)Dear student My name is Bob,I live in Toronto,Canada,I think china is a very interesting Country,I'm eleven years old,and a little chinese,I like collecting stamps and postcard.there are full of them in my room,but 同义句转换 Mary is good with others in the club .Please have a look at the clothes.s your pen pal from rance?o you have a good time every day?Would you please take care of my daughter?Thank you for telling me the news.Bob is eleven years old.You Mr Smith is an old friend of _________.A.Bob's mother B.Bob's mother's C.mother of Bob D.Bob mother's答案选“A” the water park is ----------from hereThe water park is ----------from hereA.an eleven lilometres walk B.a eleven-kilometres walkC.the eleven lilometre walk D.an eleven-kilometre walk --How is Bob --He is （ ） A:Good.B:F--How is Bob--He is （ ）A:Good.B:Fine.C:Bob Miss Green is() and () english teacher.A .bob's,jane B.bob,jane's c .bob's,jane's D.bob,jane