He walked upto the end of the street yesterday.
Here upto shows distance.
We use till for time not distance.
The word WITHOUT in the sentence tells us that the speaker has run without breaks.
Preposition means before a position.
Preposition is a word placed before noun or a pronoun to show its relation to some other word in the sentence.
We should use In for period of time, name of season/month/year.
I always walk in the morning/winter/summer/January.
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