Question

why do you think henry ford forget to put reverse gear in his first car​

Answer 1

Explanation:

This site doesn't precisely explain the reasons for your question, but it does seem to imply that reverse gears simply weren't thought of, or perhaps thought to be of any importance. There were, by the way, several manufacturers and inventors who came out with cars well before Mr. Ford, and Ransom Olds is known to have experimented with the assembly line process before Ford made it successful.