At present, no comprehensive dialectology has been done in the Tagalog-speaking regions, though there have been descriptions in the form of dictionaries and grammars on various Tagalog dialects. Ethnologue lists Lubang, Manila, Marinduque, Bataan, Batangas, Bulacan, Tanay-Paete, and Tayabas as dialects of Tagalog. However, there appear to be four main dialects of which the aforementioned are a part; Northern (exemplified by the Bulacan dialect), Central (including Manila), Southern (exemplified by Batangas), and Marinduque.
Perhaps the most divergent Tagalog dialects are those spoken in Marinduque. Linguist Rosa Soberano identifies two dialects, western and eastern, with the former being closer to the Tagalog dialects spoken in the provinces of Batangas and Quezon.
One example is the verb conjugation paradigms. While some of the affixes are different, Marinduque also preserves the imperative affixes, also found in Visayan and Bikol languages, that have mostly disappeared from most Tagalog dialects by the early 20th century; they have since merged with the infinitive.