Universal 478:

Original: If the head (lexical) verb in a progressive verb phrase is marked for tense, it is marked as present tense.
Standardized: When the head (lexical) verb in a progressive verb phrase is marked for tense, THEN it is marked as present tense.
Keywords: tense, present, aspect, progressive
Domain: inflection
Type: unconditional
Status: achronic
Quality: absolute
Basis: languages surveyed in Blansitt 1975
Source: Blansitt 1975: 30

FP