Autocorrect issues in French

Macbook pro (retina, 15-inch, mid 2015)

Yosemite 10.10.4

2.5 Ghz Intel Core i7

16 gb 1600 mhz ddr3

intel iris pro 1536 mb

Pages 5.5.3

English US keyboard setup

Language of document is French

I'm having issues with autocorrect and autocompletion in French language. Often, when I begin typing a word, the autocorrect function will replace the beginning of that word with another. For example, I will type "anéa" for the beginning of the word "anéantir" (to annihilate), but autocorrect will switch the word to "ana" before I even finish typing the full word. This is only one example of many instances that the same kind of issue has happened to me while typing in French.

Anyone have an idea as to why this is happening? I really don't want to turn autocorrect off, but I may have to (as long as spell check is still active!).

Many thanks in advance.