Quote Originally Posted by Kim_2320
...

I also have some questions..

According to my teacher, she told me that I have to put a d and an apostrophe before the month because it begins with a vowel. That was how she corrected me when I didn't do that.
What do you think?
I would say like every word that begins with a vowel. You don't put a d' just before each month but only when it makes sense in the sentence to add one. Here are some examples.
- il est parti au mois d'ao