While reading a grammar book, I learned を may mark a.) a starting point of
where a movement occurs, or b.) mark a location where a movement occurs.
Examples:

> a1.) 車｛くるま｝ **を** 降りました｛おりました｝。(He) got out of the car.
>
> b1.) 危ない｛あぶない｝なあ！歩道{ほどう｝ **を** 走る｛はしる｝なよ！(That's) dangerous! Don't ride on
> the sidewalk!

However, other particles serve similar functions, and I don't quite understand
the differences in usage. For example,

> a2.) 車 **から** 降りました。
>
> b2.) 危ないなあ！歩道 **で** 走るなよ！

Why would someone used を in the first sentence instead of から? Why would
someone use を in the second sentence instead of で? How do the meanings in
these individual sentences change between one choice over the other? When to
use を in sentences like these and when to use different particles?
CC BY-SA 4.0
2018-08-19T02:57:52.167
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2018-08-21T02:09:35.877
2020-06-17T08:18:27.500
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question
grammar particle-を particle-で particle-から
を usage over から and で in example sentences related to movement