я не хочу ехать с группой. я хочу поехать сам.
I understand perfectly well the use of perfective after хочу. But I don't understand why the verb becomes imperfective just because of the presence of не. Any explanation for this? And is this a rule (imperfective after не хочу and perfective after хочу)? Thanks.
Such the interesting question!
The grammar is approximately as:
1) A perfect form (also called the perfective or aoristic form) is an aspect of a verb used to describe a complete, indivisible, complete act, regardless of whether it occurs in the future, present, or past.
2) An imperfect form is a grammatical category that expresses how the speaker interprets the passage of an action over time (for example, he sees the action as continued, momentary, permanent, and so on.)
( In many languages, the imperfect form does not have an independent expression: instead, certain species values are associated with different time forms.)
Ехать и идти - это глаголы движения.
Let's say that verbs of movements have two main rules:
1) the perfective verbs "
пойти" and "
поехать"
have the meaning of start of movement.
2) the imperfective verbs "
идти" and "
ехать"
have a more pronounced ability to express the nearest future tense:
"Завтра я иду на концерт". Tomorrow I go for concert.
(but perfective in russian - Завтра я пойду на концерт. Tomorrow I'll go for concert. )
Other words - the verbs of movements have nothing to do with -хочу или не хочу...
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But the rest (or better say - the most of) of pf or impf verbs in russian are depending of - хочу or - не хочу:
1) if the verbs after its are "objectively constructive" ((с)делать, открывать/ открыть, поддержать/ поддерживать, (по)смотреть и подобные.) - You have to choose IMPERFECTIVE verb infinitive :
не хочу делать, открывать, поддерживать, смотреть......
2) if the verbs after its are "objectively negative" (ронять/ уронить, падать/ упасть, забывать/ забыть, (за)болеть, (по)терять, заблудиться и подобные) - You have to choose PERFECTIVE verb infinitive:
не хочу уронить, упасть, забыть, заболеть, потерять, заблудиться и подобное. Оттенок значения - ‘опасение’: ‘боюсь’ уронить, упасть, заблудиться и подобное.
https://metodika-rki.livejournal.com/135964.html
инфинитив после "хотеть": употребление