Yes. Go to multiplayer settings > Chat= off.
you, assuming you don't have admin powers, can't. Ask your admin to turn it off, but uless it's your server, you won't be able to.
The server option for online mode must be off.
it depends if it is on multiplayer or not. if it is on multiplayer and local than yes.
/gamemode your name 1Then the same with 0 to turn it off. IF your an OP or admin.Type in "help" or "?" in the server window to get a list of server commands.
you can in multiplayer mode. you can in multiplayer mode.
To get out of the chat, press X.
With the original "vanilla" game you can only turn them on or off in multiplayer. There are quite a few Mods that you can pick and chose which ones you want. In single player and multiplayer. They also can make all kinds of different animals too, good and monster.
You can only turn off the rain if cheats are enabled. If they are, the command is /toggledownfall
The button "O".
Just switch the chat to Clan or anything else than "all"
To turn the ultimate safe chat off you need to log into the parent zone and select safe chat mode.