I don't speak so well as you do.
我没有象你说得那么好.
I don't speak so well as you do.
我没有你说得那么好.
I do not speak so well as you do.
我没有你说得那么好.
My radio works not so well as my brother's.
我的收音机工作不如我兄弟的好.
应该是用于否定句的.