l can’t run and walk.
l can’t run and can’t walk.
1. l can’t run and walk. 2.
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1. l can’t run and walk.
2. l can’t run and can’t walk.
Sentence #1 sounds more natural and is less wordy.
Sentence #2 is a little wordy and sounds a bit repetitive,
However the second use of can't can be used for emphasis if you say it louder and longer (give it more stress).
You could change sentence # 1 to; I can't run or walk. T