Many of the keyboards have letters missing/gone.

固定用法,再如：
My bag is missing.
When I returned,my bag was gone.
再问： When I returned, my bag was gone.go有被动吗，为什么不是had gone?
再答： had gone不是被动语态，是过去完成时。When I returned, my bag was gone.句中的was gone是过去时的被动语态
再问： was gone的意思是被偷吗？
再答： 不一定，但一定是：不在了，失踪了