按要求改写句子。
1. There are twenty-four books on the desk? (划线部分提问)
____________ _____________ books are there on the desk?
2. There are some flowers in the garden. (改成否定句)
There ____________ ____________ flowers in the garden.
3. I can play the violin. （划线部分提问）
____________ can you ____________?
4. This is a ruler.（改成复数句）
These ____________ _____________.
5. I can sing some songs.(改成一般疑问句)
__________ ___________ sing any songs?
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