What is wrong with the following sentence and what should be done to fix it you were walking down street when all of a sudden warthog ran by at full speed in other direction?

* Missing articles: "Street" needs an article ("the" or "a").

* Capitalization: "Warthog" should be capitalized.

* Punctuation: A comma is needed after "sudden" to separate the introductory phrase.

* Word choice: "In other direction" is awkward and could be replaced with a more concise phrase.

Here's a corrected version:

You were walking down the street when all of a sudden, a warthog ran by at full speed in the opposite direction.