Principal Parts of Common -μι Verbs
Principal parts worth memorizing early
δίδωμι: δίδωμι, δώσω, ἔδωκα, δέδωκα, δέδομαι, ἐδόθην τίθημι: τίθημι, θήσω, ἔθηκα, τέθηκα, τέθεμαι, ἐτέθην ἵστημι: ἵστημι, στήσω, ἔστησα / ἔστην, ἕστηκα, ἕσταμαι, ἐστάθην ἵημι: ἵημι, ἥσω, ἧκα, -εἷκα, -εἷμαι, -εἵθην
ἵστημι is especially important: its aorist can distinguish transitive “set/stand something” (ἔστησα) from intransitive “stand” (ἔστην).
Source: Morphology sheet, p. 22.