6. there were 2 suggestions:
(i) tenpo seli la, tenpo lete la, tenpo suno la, tenpo pimeja la mi olin e sina
A la B la C la D la E is (A or B or C or D)=>E
(ii) tempo suno kama la sina kama la mi pilin pona
A la B la C is (A=>B)=>C
i better like the option (ii). i would find a good use for this scheme
2. the preposition itself makes a regroupping, so we dont need pi if we really consider it as a preposition between 2 nouns. but if we consider it as a modifier with specific meaning, then we probably need pi.
1. good idea, but comma is not a good choice. may be this: jan li pana e sitelen `tawa mi. but the use of ` should not be mandatory.