prokázali

Prokázali is a Czech verb form meaning they proved or demonstrated. It is the past tense, third person plural form of the perfective verb prokázat, which is used to indicate that a claim, hypothesis, or fact has been shown to be true through evidence or argument. In Czech, past tense forms agree with the subject in gender and number; prokázali specifically corresponds to masculine plural or a mixed-gender group, while feminine plural would be prokázaly and neuter forms vary (prokázalo for singular neuter, with other inflections for different constructions).

The term is commonly used in legal, scientific, academic, and journalistic contexts, where evidence or findings are described as having been established. Because prokázat is perfective, prokázali conveys that the proving event was completed in the past; it is often contrasted with imperfective verbs that emphasize ongoing or repeated actions.

Related forms of the verb include prokázat (to prove), prokazovat (to emphasize or to demonstrate in a continuous sense), and other past tense variants such as prokázala (feminine plural) and prokázalo (neuter singular). The construction with the auxiliary býti in the past and the corresponding participle is common in Czech syntax when forming past tense narratives.

Example: Vědci prokázali souvislost mezi faktory. Translation: Scientists proved the connection between the factors. This illustrates how prokázali is used to report a completed demonstration or proof by a subject.