Strong inflection is a characteristic of lexemes, not individual tokens. In traditional English tagsets, e.g., SUSANNE or the PennTreeBank tagset, surface ambiguities are normally not resolved. Uninflected forms and forms that have the same form (e.g., "be" as an imperative) are tagged as BaseForm. (Ch. Chiarcos) Since it is impractical (...) to resolve automatically the ambiguity of these six morphological functions, it is a common practice to assign a single value to the base form, or else to assign two values, one for the finite and one for the non-finite functions. Because of this, the tables below show two tagsets: one tagset representing the 6 attribute-values above, and a reduced tagset (`RTags'), which resembles most tagsets so far used for the English language in reducing the six values to two. http://www.ilc.cnr.it/EAGLES96/morphsyn/node150.html#SECTION00054000000000000000 BaseForm is not a characteristic of lexemes, but specific to certain forms in a complex paradigm.