An educating puzzle (Present Perfect)

[Rinoceronte]

The point of solving this puzzle is in that the solution brings you closer to understanding of the essence of this extremely controversial tense.


Just to spur you a bit, this puzzle was solved in seconds by my students who have been being taught the tenses consistently.


So, the puzzle:


The equivalent to Present Perfect existed in Latin. It looked like "habeō factum" in this ancient language. The scholars who traced the tense's roots back to the first century A.D. (in particular, Rodríguez Molina) complain that there are quite few written sources containing sentences formed in this tense.


Why?

[shoaib 1]

The point of solving this puzzle is in that the solution brings you closer to understanding of the essence of this extremely controversial tense.


Just to spur you a bit, this puzzle was solved in seconds by my students who have been being taught the tenses consistently.


So, the puzzle:


The equivalent to Present Perfect existed in Latin. It looked like "habeō factum" in this ancient language. The scholars who traced the tense's roots back to the first century A.D. (in particular, Rodríguez Molina) complain that there are quite few written sources containing sentences formed in this tense.


Why?

"The scholars who have traced........"