On a Mac, go to SYSTEM PREFERENCES by clicking on the APPLE ICON on the top left of the MENU BAR. On the top row titled PERSONAL, choose INTERNATIONAL. Go to INPUT MENU, from there choose the languages you want to type with. After you choose them you should see at the bottom of the LANGUAGE LIST MENU a list of INPUT MENU SHORTCUTS. You can change them or keep them the same. These is how you will be able to switch from your NATIVE LANGUAGE to DESIRED LANGUAGE you want to type in. The INPUT CHOOSE OPTION below the INPUT MENU SHORTCUTS allows you to USE ONE LANGUAGE FOR ALL DOCUMENTS or ALLOW A DIFFERENT INPUT LANGUAGE FOR ALL DOCUMENTS. I use the last optioon.Choose SHOW INPUT MENU IN MENU BAR to see the list of languages and options you have. Close SYSTEM PREFERENCES. The INPUT MENU is on the RIGHT SIDE of the MENU BAR. Click it to see your list of items. You can use the KEYBOARD SHORTCUTS to SWITCH LANGUAGES. Play with the InPUT MENU. There are some cool features like the CHARACTER PALETTE and KEYBOARD VIEWER.