du'umdu fu'ivla

x1 is a proposition/predication (statement with a truth value), stating that x2 is true

Brivla-form of du'u. x1 and x2 are identical (filling them would equate the two sumti). See fatci, jetnu, jitfa, jufra, bridi, nundumu

In notes:

du'umrei
x1 (du'u with kau) is the indirect question of predicate relation x2 (ka), with answers x3 (sumti sequence)
li'imdu
x1 (li'i) is the subjective conscious experience of x2 (nu or ka-of-x3), as experienced by x3
nildumu
x1 (ni) is a quantity
si'omdu
x1 (si'o) is an idea/concept/thought about x2 (object/abstract) by thinker x3.
sumdaiklei
x1 (mass) is the object type of argument object x2, as defined by property x3 (ka)
su'umdu
x1 is the predicate abstraction described by text x2, and is of type x3