1、My brother is playing basketball .（改为一般疑问句）
__Is__ your brother _playing___ _basketball___?
2、Lily is writing a letter to (her pen pal ) .(对括号内部分提问）
_Whom___ _is___ Lily writing a letter to
3、The story isn't interesting ,i think.（同义句转换）
I _don’t___ think the story _is__ _interesting___.
I _think___ the story is _boring___.
4、My father is at work .（同义句转换）
My father __is__ _working___.
5、He is shopping .（改为否定句）
He isn’t shopping．
希望能够帮到楼主