the pencil on the desk of tim's is white有错吗?

the pencil on the desk of tim's is white有错吗? （who)pencil is on the desk? The pencil is long on the desk和The pencil on the desk is lon The phone is on the desk?语法有错吗? the pencil on the desk is new 可不可以说成 the pencil on the table the book on the desk is mine这句话有错吗?on the desk是什么成分?状语? there is a pencil sharpener on the desk改成疑问句 my pencil case is on the desk .There is an eiaser in it.the 英语帝来一下My pencil case is on the desk.[对on the desk提问]Are your there is a pencil on the desk （改否定句）__ __ __ __ on the desk Tom's pencil is under the books on the fioor与Tom's pencil is What is on the desk?-------a pencil case.A.it is B.this is C