Athematic presents (and imperfects) are the easiest verbs of all because there is no thematic vowel (changing from o to e) to contract with the endings. So you just plug 'em in:

present =

δυνα +

be able, can

 

κει +

lie, be put

 

επιστα +

know (how)

μαι

σαι

ται

μεθα

σθε

νται

σθαι (infinitive]

 

imperfect =

ε + δυνα +

was/were able, could

 

ε + κει +

was/were lying, lay

 

ἠπιστα +

knew, understood

μην

σο

το

μεθα

σθε

ντο

 

 

 

For the following forms, all present or imperfect, match the trans.

AND give singular for plural

 

δύνανται

κείμεθα

ἠπίστασο

δυνάμεθα

ἔκειντο

δύνασθαι

ἠπίστασθε

ἐδυνάμεθα

ἐπίστασθαι

ἐδύνατο

to  know
we are able
we were able

you knew (impf)

he was able

they lay/were lying

to be able

y'all knew
they are able
we lie (down)