Learn Turkish: Piramitleri uzaylılar inşa etmiş olamaz. - Aliens cannot have built the pyramids.

This is the negative epistemic past deduction structure. It combines a verb in the -mIş past tense (inşa etmiş) with olamaz, the negative ability form of olmak in the aorist tense. Together, -mIş olamaz means "cannot have done" or "it is impossible that they did". You use this when making a strong logical deduction that something did not happen in the past.

Why is the object Piramitleri at the very beginning of the sentence instead of the subject uzaylılar?

In Turkish, the standard word order is Subject-Object-Verb, but you can move words around to change the focus. The position immediately before the verb is the most emphasized. By placing uzaylılar (aliens) right before the verb group inşa etmiş olamaz, the speaker emphasizes who couldn't have built them. The focus is specifically on ruling out aliens.

Why is the accusative case used in Piramitleri?

Piramitleri is the specific, definite direct object of the verb inşa etmek (to build). It is formed with piramit (pyramid) plus -ler (plural) plus -i (definite accusative suffix). Because we are talking about the specific pyramids, it needs the accusative case to show it is a known, definite object.

Can you break down the word uzaylılar?