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Event factuality is the level of information expressing the factual status of eventualities mentioned in text. That is, it conveys whether eventualities are characterized as corresponding to facts, to possibilities, or to situations that do not hold in the world. As such, it touches on two categories more standardly assumed in the literature: modality and evidentiality. They both have been widely discussed in linguistics and philosophy, but it is not until recently that have started to receive some attention within the area of NLP.