后面是看a pair 还是shoes

a pair of_________(shoes,trousers.) 后面是复数还是单数? 是I have a pair of new shoes.还是 I have a new pair of shoes. 是a beautiful pair of shoes 对还是a pair of beautiful shoes对? this is a pair of shoes 后面的谓语用单数还是复数? how much is a pair of shoes 还是how much are a pair of shoes? a pair of new shoes 还是a new pair of shoes a new pair of shoes 还是a pair of new shoes?为什么? 一双新鞋是a pair of new shoes还是a new pair of shoes a big pair of shoes 还是 a pair of big shoes a pair of shoes This is a pair of shoes .can i try ____ on 是填it 还是 them There ( ) a pair of shoes on the floor.括号里面是is还是are呢