Why the bird can fly

why does the bird fly The bird can fly in the The bird can fly in the sky. Bird can fly The bird can fly to the moon.变否定句 can the bird fly in the sky?回答. Look,The bird can fly so in the sky which bird can't fly? (Birds) can fly but (fish) can't A the birds,fish B the bird A bird can fly.(改为否定句) Can you fly ( ) like a bird? the bird can fly in the sky.（改一般疑问句,作答）