Universal #481
Legacy number: 481
| Number | 479 |
| Original | There is never a special future progressive form unless there is a past progressive form as well. |
| Standardized | IF there is future progressive form, THEN there is also a past progressive form. |
| Formula | ¬past progressive form ⇒ ¬future progressive form |
| Keywords | tense, past, future, aspect, progressive |
| Domain | inflection |
| Type | implication |
| Status | achronic |
| Quality | absolute |
| Basis | languages surveyed in Blansitt 1975 |
| Source | Blansitt 1975: 30 |
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