It might not happen
@Jorbin. Not everyone with dementia loses their language.
My husband didn`t use as many words and when I asked him questions I made sure they could be answered with yes or no. Even just before he died I would ask him if he was comfortable or if he wanted a drink and he understood what I was saying.
Care staff will be experienced in communicating with people who need a simpler form of language.
From the way you are posting here on Talking Point I hope it will be a very long time before you have any language difficulties.