is Sally at school?is 前面要加什么?

is Sally at school?is 前面要加什么? what foreign language ( ) at Sally is school?Chinese Sally is at school.改为一般疑问句和否定句 Is Sally good at schoolwork? Is Sally good at ___________? much difficult than前面加什么is? (Tim is at school) Everyone is at school. who is the man 前面要加什么时才要变成who the man is? sally is on her school basketball team.为什么不用in Sally is good at ___(play)the violin. Sally is good at studying computer science.(将句子改为