Chapter 10: Imaginary Journeys: The Lojban Space/Time Tense System
What is the significance of failing to specify an interval size of the type discussed in c10-§5? The Lojban rule is that if no interval size is given, the size of the space or time interval is left vague by the speaker. For example:
✥6.1 mi pu klama le zarci I [past] go-to the market.
- At a moment in the past, and possibly other moments as well, the event “I went to the market” was in progress.
✥6.1 points up a fundamental difference between Lojban tenses and English tenses. An English past-tense sentence like “I went to the market” generally signifies that the going-to-the-market is entirely in the past; that is, that the event is complete at the time of speaking. Lojban “pu” has no such implication.
This property of a past tense is sometimes called “aorist”, in reference to a similar concept in the tense system of Classical Greek. All of the Lojban tenses have the same property, however:
✥6.3 le tricu ba crino the tree [future] is-green The tree will be green.
does not imply (as the colloquial English translation does) that the tree is not green now. The vague interval throughout which the tree is, in fact, green may have already started.
This general principle does not mean that Lojban has no way of indicating that a tree will be green but is not yet green. Indeed, there are several ways of expressing that concept: see c10-§10 (event contours) and c10-§20 (logical connection between tenses).