Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
ecquando, adv. interrog. [ec, cf. ecce, and quando], ever, at any time; in a passionate (esp. indignant) interrogation (rare but class.): ecquando te rationem factorum tuorum redditurum putasti? ecquando his de rebus tales viros audituros existimasti? Cic. Verr. 2, 2, 17; 2, 5, 26; Cael. ap. Cic. Fam. 8, 15; Liv. 3, 67; Sen. de Ira, 3, 28; Val. Fl. 2, 395.
With nisi (= num unquam … nisi), Cic. Fin. 5, 22, 63; id. Agr. 2, 7, 17.