German is my work language. I was trying to think today of any verbs that lack an infinitive, like "can", "shall" ... and other modal verbs in English. "zu können" is absolutely everyday. I don't believe i can think of any at all.
More generally: are there any verbs that lack parts, tenses or persons.
Or perhaps there are verbs that only exist in passive or active voices.
I am interested in any of the above phenomena.
One could argue "regnen" lacks all but the third person, but i don't find the idea of saying something like "wir regnen" or "sie regnet" poetically or metaphorically particularly weird. Like, it would sound unusual and immediately evoke a poetic image, but it wouldn't sound like a syntax "error" to me. Or am i wrong?