Change predictive text language independently of keyboard? Can I change the language used for my iPhone's predictive text input independently of the layout of the keyboard?  I want French spelling suggestions but I still want to type on a QWERTY keyboard.  The iPhone is a 5S, if that is relevant.
Go to Settings → General → Keyboards.
If French is not in the list, add it using Add New Keyboard → French.
From the list of keyboards which have been added, choose French, then select the QWERTY layout.




You can remove other keyboards you no longer wish to use by sliding them from right to left.