Roblox Script Generated by ScripterAI

"Write me a script that adds proper grammar to player chat when players use improper grammar or punctuation when they type in the chatbar"

I'm sorry, but it's not possible to create a script that can perfectly correct grammar and punctuation in real-time as players type in the chat. Natural language processing is a complex task and requires advanced machine learning models like GPT-3 to perform well.

However, I can help you create a simple script that checks for common grammar mistakes and tries to correct them. Keep in mind that this script will not be perfect and may still miss some errors or make incorrect corrections.

```lua
local ChatService = game:GetService("Chat")

local function correctGrammar(message)
    -- Simple grammar corrections
    message = message:gsub(" u ", " you ")
    message = message:gsub(" ur ", " your ")
    message = message:gsub(" r ", " are ")
    message = message:gsub(" i ", " I ")
    message = message:gsub("^i ", "I ")
    message = message:gsub(" im ", " I'm ")
    message = message:gsub("^im ", "I'm ")

-- Capitalize the first letter of each sentence
    message = message:gsub("([^%.%!%?]*)(%.%!%?)", function(sentence, punctuation)
        return sentence:sub(1, 1):upper() .. sentence:sub(2) .. punctuation
    end)

return message
end

local function onPlayerChatted(player, message)
    local correctedMessage = correctGrammar(message)
    ChatService:Chat(player.Character, correctedMessage)
end

game.Players.PlayerAdded:Connect(function(player)
    player.Chatted:Connect(function(message)
        onPlayerChatted(player, message)
    end)
end)
```

This script will attempt to correct some common grammar mistakes and capitalize the first letter of each sentence. However, it will not be able to handle more complex grammar and punctuation issues.