Yes, the ball is still considered in-play.
Yes
As little as possible because they walked the whole way.
Japan walked out.
Both are correct. 'He walked by me' is more colloquial, and also conveys more possible meanings, than 'he walked past me'.
He walked on his two feet
Edwin "Buzz Aldrin"
only on wednesdays
Edwin Aldrin was the second man to walk on the moon, after neil Armstrong walked.
When you walked in the door, everyone looked.
My brother used to tie my jump rope around Mrs. Beasley's neck and hang her out a second story window so I'd see her dangling there as I walked home from school.
Neil Armstrong was the first, Edwin Aldrin was the second. In total so far, 12 NASA astronauts have walked on the moon.
You avoid it by avoiding sentences like "You walk to the store and buy a carton of milk" and instead saying "He walked to the store" or "I walked to the store." Second person is the one where the whole book is written as "you."