In the first place, your forms are certainly correct, although they are lacking accents:
1 pl. impf. indic. act. ἐπηρωτῶμεν, 2 pl. impf. indic. act. ἐπηρωτὰτε
I've never thought to use a parsing tool at all. What I would consult if I felt insecure
about these particular forms is the paradigms in Smyth's grammar; I would expect
the forms for ἐπερωτάω to follow strictly the paradigm of alpha-contract verbs.
Why Perseus doesn't work for these forms I don't know, unless it's that these forms simply do not
appear in any of the texts in the Perseus corpus -- but I don't know whether the parsing tool is
supposed to fit all regular verbs or not.
Another resource for verb forms you might like to know about is Kalos software at:http://www.kalos-software.com/
It has downloadable programs for Windows and a .jar platform-independent one that will do
verb analysis and produce charts. The most recent version is kalos 4.4, released in January
of 2011. Kalos will do a number of different things, including definitions in English, French,
For irregular verbs, I would always check the initial section of LSJ entries for verbs, where all forms that are unpredictable are listed.
Carl W. Conrad
Department of Classics, Washington University (Retired)
ἄτοπον, ἔφη, λέγεις εἰκόνα καὶ δεσμώτας ἀτόπους.
ὁμοίους ἡμῖν, ἦν δʼ ἐγώ. Plato, Rep. 7 (515a)