Forget the link and its worksheets. I am dismayed that a literacy organization provides this type of "support" for the teaching of grammar. I have to think this organization simply does not know its own history when it comes to grammar. Fortunately, the work of George Hillocks and others still exists. Ironically, here is a piece from NCTE which is allied with the literacy group that posted the link to the worksheets: http://www.ncte.org/magazine/archives/125935.
And here is the money quote: "Many people think that direct instruction and drill in grammar -- the exercises remembered from their own schooling -- provide the shortest, most logical route. About a century of research, however, indicates otherwise. In classrooms where much of the time is spent on grammar exercises, student writing may even get worse. That's because, in those classes, students are spending more time underlining parts of speech or diagramming sentences than actually composing."
Let us not have to fight this battle again.