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.