按要求改写下列句子，一空一词，含缩略词。Jack has an eraser in his pencil case.（改为一般疑问）
Jack an eraser in his pencil case?I think tennis is very interesting. （改为否定句）
I tennis is very interesting.Her books are on the sofa.（对划线部分提问）
are books?There are old bikes under the tree.（变为单数句）
There old bike under the tree.打乒乓球对我来说很简单。（完成译旬）
Playing ping-pong is me．
His mother made a big cake for his birthday．（改为被动语态）
A big cake by his mother for his birthday．
I borrowed an English book from my classmate．（改为同义句）
My classmate an English book me．
Lucy borrowed the book 5 days ago．（改为同义句）
Lucy the book for 5 days．
They were at home last night．（改为一般疑问句）
at home last night？
The girl in red is my friend．（对划线部分提问）
is your friend？