princ. parts	present (=imperfective)	perfect	[future ]
saevio, saevīre, ---> saevivi, saevītum	saevire, (act.) saevīri (pass.)	saevi(vi)sse saevītum esse	[saeviturum esse saevitum iri]*
teneo, tenēre ---> tenui, tentum	tenēre tenēri	tenuisse tentum esse	[tenturum esse tentum iri]
pello, pellere pepuli, pulsum	pellere pellī	pepulisse pulsum esse	[pulsurum esse pulsum iri]
e-gredior, e-gredi --> egressum	e-gredi	egressum esse	[why bother?]
de-fero, -ferre --> -tuli, -latum	de-ferre de-ferri	de-tulisse de-latum esse
quaero, quaerere --> quaesivi, quaesītum	quaerere quaeri (< quaer(er)i)**	quaesi(vi)sse quaesitum esse
curro, currere ---> cucurri, cursum	currere (intrans., no passive)	cucurrisse (but con-currisse)

* future passive infinitive is rare (and dubious) =

the accusative supine (verbal noun ~ 4th part, accusative expressing goal or aim)

+ passive infinitive of eo, īre ‘go’ (which is totally irrational)

(not to be confused with the gerund(ive) in indirect discourse, arcendam vim [esse])

** 3rd conjugation present passive infs. (‘to be driven, sought, etc.), lose the –r- (weakened as the short stem-vowel would have no accent)