pysähtyisivät

"Pysähtyisivät" is the conditional form of the Finnish verb "pysähtyä," which translates to "to stop" or "to halt." The "-isivät" ending indicates the third-person plural conditional mood. Therefore, "pysähtyisivät" means "they would stop" or "they would halt." This form is used to express hypothetical or unreal situations in the past, present, or future concerning a group of subjects.

For example, in a sentence like "Jos sade olisi alkanut, autot pysähtyisivät" (If the rain had started, the cars would have stopped), "pysähtyisivät" describes a hypothetical action of the cars stopping based on a preceding condition. The conditional mood in Finnish allows for expressing nuances of possibility, desire, or polite requests, and "pysähtyisivät" specifically conveys this hypothetical stopping by a plural subject. It is a common and essential verb form for constructing complex sentences and expressing non-factual scenarios in Finnish.