Luke 19:42

If thou hadst known (ei egnw). Second aorist active indicative of ginwskw. Second-class condition, determined as unfulfilled. Even thou (kai su). Emphatic position of the subject. But now (nun de). Aposiopesis. The conclusion is not expressed and the sudden breaking off and change of structure is most impressive. They are hid (ekrubh). Second aorist passive indicative of kruptw, common verb, to hide.