Questions & Answers about Hänen entinen vaimonsa mahtaa asua täällä.
Why is asua in the 1st infinitive here instead of being conjugated?
Just like sattua (to happen to) from your current lesson, the verb mahtaa acts as an auxiliary verb and requires the following verb to be in the basic dictionary form (1st infinitive). In this construction, mahtaa carries the meaning of probability, so mahtaa asua translates to "probably lives".
What exactly does mahtaa mean here, and is it interchangeable with taitaa?
Both mahtaa and taitaa express probability ("probably", "seems to") and take the 1st infinitive. However, mahtaa often carries a nuance of wondering or pondering to oneself ("I wonder if she lives here"), whereas taitaa feels more like a direct deduction. They are often interchangeable, but mahtaa has a slightly more thoughtful or guessing tone.
Why does vaimonsa have the -nsa possessive suffix when Hänen is already specifying "his"?
In standard written Finnish, 3rd-person possessives require double marking: you need both the genitive pronoun (hänen) and the possessive suffix (-nsa / -nsä) on the noun. While spoken Finnish often drops the suffix (saying just hänen vaimo), the formal rule requires both. Note that the adjective entinen does not take a possessive suffix.
Why use täällä instead of for "here"?