Daisy ran very fast when she was young. （改为一般疑问句）
Daisy very fast when she was young？
Linda thinks it's easy to write Chinese words. （改为否定句）
Linda it's easy to write Chinese words.
I have been learning English for over 9 years. （对画线部分提问）
have you been learning English？
If I'm available tomorrow afternoon，I （visit）the city museum with my brother.
We couldn't do all the work by （ us）.