Tom and Jim are two ___.They speak___ .a.American,English b.Americans,English答案上是B,为什么,要原因,要原因.American是不可数名词吗?如果是,那后面为什么会加S那么Canadian Chinese Japanese 等等加S或ES吗？

英语翻译These two rooms are a Tom and Jim's bTom's and Jim cTom's and Jim's Tom and jim are ( ) basketball jim and tom are good_____(friend) Tom and Jim are doing_____(they)homework. Tom and Jim are brothers.Tom looks likes Jim.(同义句）Tom and Jim are brothers.They ( )( )( ). these are ____new blue sweaters.A.Jim and Tom’ B.Jim’s and Tom’s these are ____new blue sweaters.A.Jim and Tom’ B.Jim’s and Tom’s Tom and Jim are the brothers ,Tom looks like Jim.同义句 Jim and Tom Jim,are,my,Tom,brothers,and(连词成句) Tom and Jim are goodfriend变成一般疑问句作出回答 Tom and Jim are good friends(改为否定句) Tom and Jim are at home改为一般疑问句 Jim and Tom are twins,they're twin b__? Jim and Tom are Mr Black's c____. Tom and Jim are sister.要加S吗 They are Jim and Tom desks.这句语法对吗 Jim and Tom are both on the soccer team.Both Jim and Tom are __ __ the soccer team.