Event factuality (or factivity) is understood here as the level of information expressing the factual nature of eventualities mentioned in text.
expressing whether they correspond to a fact in the world (Example (1a)), a possibility (Examples 1b,1c), or a situation that does not hold (Example 1d), as is the case with the events denoted by the following underlined expressions: 2 (1) a. Har-Shefi regretted calling the prime minister a traitor.