I'm having trouble knowing how and where to begin teaching grammar usage rules to my 7th grade language arts classes. For example, we just spent a week or so learning how to identify the subject and predicate of a sentence and then I tested the kids (two-thirds of them got it) and then it seems like when we move on to another skill the one we just learned goes out the window. Now I'm covering comma usage. Is there anyway to tie all these rule together into a thematic or more cohesive unit? Or is grammar something that should be taught in a "nuts & bolts" fashion. One side of me wishes I could find a way of making the rules of grammar more fun to learn, but then the other side of me thinks that learning grammar shouldn't be fun? Help! Is the best way to learn the rules of grammar through drill and practice from a workbook?