Copala Triqui asa' 'when'

The Triqui complementizer asa' is rather unusual in its syntax.  It means 'when' for future events.  However, it is not followed by a verb in the potential aspect — the usual way to show future in Triqui.

Instead it is usually followed by the completive aspect, as in the following two examples:

This example seems to say literally  'I will speak to you when I arrived…'

The next example is also interesting:

In this example, look at the two instances of the verb 'yaj 'make, do'.  Both refer to future events, and the first instance has the regular morphology of potential aspect — qui'yaj.  The second instance follows asa', so it instead appears in the completive form qui'yaj.

This is somewhat reminiscent of the inversion of normal aspect morphology after the negative particle, when semantic future shows up with completive morphology.  However, after the negative, we also get the reverse — semantic past shows up with potential morphology.  The shift after asa' happens in only one direction.

Possibly we want to think of certain morphemes like asa' as having floating autosegmental material that suppresses the normal low register for the following verb?