A categorizing primary progressive aphasia (PPA) based on evaluation of grammar, repetition, and word comprehension with proposed recommendations for clinical diagnosis of PPA variants. For each PPA subtype, the bar graph additionally shows the imaging-supported features, initial aphasia subtypes, and major proteinopathy findings. The difference in repetitions between nfvPPA and lvPPA is that individuals with lvPPA show impaired sentence/phrase repetition due to phonological working memory deficits, while those with nfvPPA typically have better repetition abilities, but struggle with speech production due to apraxia of speech and agrammatism. svPPA; semantic variant primary progressive aphasia, Lt; left, nfvPPA; nonfluent/agrammatic variant primary progressive aphasia, FTLD-TDP; frontotemporal lobar degeneration with transactive response DNA-binding protein, FTLD-tau; frontotemporal lobar degeneration with tau pathology, lvPPA; logopenic variant primary progressive aphasia, Aβ; Alzheimer's disease pathology.