Two language on android I'm french, my system is in french.
I would like to be able to type english words without being bothered by the autocorrection. 

How can i proceed ?

Edit: Free solutions please
If I remember well:

In the language and input settings click the settings icon next Google Keyboard.

You can then change the input languages settings and select multiple languages.

Finally go the advanced settings there should be a way to enable a key that allows you to easily switch your input method when typing (from memory it was by holding the space bar)

Bon courage!