The tag grammar is one of our most highly-used tags, though it is, unfortunately, so vague as to be nearly useless. I submit the following proposal as a way to break up this tag into something useful.
- Following nohat's answer, questions about the grammatical acceptability of a particular sentence or construction should be tagged grammaticality, as many questions already are.
- Questions about the meaning of grammar terms or the names of specific constructions should be tagged grammatical-terminology (new).
- Questions about the grammatical analysis of a particular sentence or construction should be tagged grammatical-analysis (new). Furthermore, syntax should be made a synonym of this tag.
- Questions tagged grammar which fit into none of these categories should be tagged with something more descriptive. Plain old grammar should be abolished as it succumbs too easily to tag rot.
The floor is open for comments and additional suggestions.