Case and auxiliary forms belong together

A class compares the original examples “Ni etorri naiz” and “Nik liburua irakurri dut”. A learner assumes that the English word I must always correspond to the same Basque form regardless of the construction. Another recognizes the noun for book but ignores how the auxiliary and participant marking fit together. A third distinguishes an intransitive coming event from the transitive reading construction. The task asks for an explanation of the contrast, not an entire memorized paradigm or a rule imported from Spanish. These are classroom examples rather than attributed quotations or a certified grammar test. No broader context determines every possible tense or discourse use of related forms. A useful response should analyse the actual case relationship and complete verb construction instead of label matching.