[In traditional grammars durative is named "present", durative past indicative "imperfect"]

8. [-ν-] This type does again present some stems that are difficult to trace back the parent verb; all stems will be found in the list of verb stems:

δάκνω, δηκ-

ἐλαύνω, ἐλα(σ)-, ἐληλα-

κάμνω, κμη-

πίνω,  πο-, πω-

τίνω, τισ-, τει(σ)-

τέμνω, ταμ-, τμη-, τμα-

φθάνω, φθη-

φθίνω