Any commands that will change the keyboard?

Question

I speak multiple languages (English, Bulgarian, Greek, and Japanese) And I was wondering if there were any keyboard shortcut commands that I can add that will go through all of the languages when I press said keyboard shortcut keys. (I use Ubuntu Mate BTW)

Answer 1

In Keyboard Preferences ( where you put the layouts that you want to use) there's a button "Options...", there is a list with several items, one of them is "Key(s) to change keyboard layout".