>>301
Yes, you can say just a series of sumti with no selbri, and yes that's mostly for the purpose of answering questions. Personally I think of a sumti-only sentence as having an elided "co'e" for the selbri. There's some contention about whether a sumti only sentence is good practice in situations other than answering questions-- it's generally agreed that it's legal, I think, but it's not agreed whether it's quite proper. When in doubt, I put in an explicit "co'e".. I like "co'e"!
I think of brivla that are within gadri or sei clauses or any such thing as still being alive. I feel those unfilled secret places there, even if there's no "be" prying open the way into them. They're still in there tucked inside of the word, filling it with its meaning. If you have [lo klama] in your story, then you've by the very nature of "klama" as a brivla brought into your story [lo se klama] and [lo te klama] and so forth. Every [klama] comes with an attached inseperable [se klama] that fundamentally makes them what they are-- going to that [se klama] transformed them into a [klama], and nothing's ever a [klama] unless it has a [se klama] that it goes to.
So I think of the place as being there always, but it's hidden unless you unfurl it with a "be" so you can tuck something in there. In terms of the grammar as a tool that we use, this is a useful trick. Selbri-turned-sumti are still manageably unsticky-- they don't swallow up sumti that come after them, so you can easily keep going with the terbri of the level you're on-- yet when you do need to have a sumti stick to the inner selbri and not the outer one, "be" is a quick syllable.
In terms of the deep structure of a bridi, though, that's all just tricks and conveniences. Really all you have is various bridi which are tied together these various ways: a "lo" bridi is tied in by its x1 being used for a sumti, a "noi" bridi is tied in by its "ke'a" being the same as the sumti it tags, etc. It should seem less like an intimidating mess once you realize that all of the bridi are really just the same animal inside, with various plumbing on the outside to fit them conveniently into sentences.