Step 1: Under Tools go to Language, and then choose Set Language.
Step 2: Choose the Language you want to Spell Check in. Click the Default button. A window will pop up asking if you want to change the default language -- it will advise you that this change will affect all new documents based on the Normal template. Click Yes. Then click OK.
Step 3: Under Tools
choose Spelling and Grammar (also F7 key). Proceed to check spelling and
grammar in the language you have selected.