These transitivizers can be followed by object suffixes, which come to modern Salishan languages via Proto-Salish. Proto-Salish had two types of object suffixes, neutral (regular transitive) and causative (when a verb causes the object to do something or be in a certain state), that were then divided into first, second, and third persons, and either singular or plural. Tentative reconstructions of these suffixes include the neutral singular *-c (1st person), *-ci (2nd person), and *-∅ (3rd person), the causative singular *-mx (1st), *-mi (2nd), and *-∅ (3rd), the neutral plural *-al or *-muɬ (1st), *-ulm or *-muɬ (2nd), and the causative plural *-muɬ (1st and 2nd). In Salishan languages spoken since Proto-Salish, the forms of those suffixes have been subject to vowel shifts, borrowing pronoun forms from other languages (such as Kutenai), and merging of neutral and causative forms (as in Secwepemc, Nlaka'pamuctsin, Twana, Straits Salishan languages, and Halkomelem).