Learn how to use y and déjà within whole French sentences my friend.
Je pense déjà à l’année prochaine.
I’m already thinking about next year.
J’ai déjà pensé à cela.
I have already thought about this.
J’y avais déjà pensé il y a trois ans.
I had already thought about it three years ago.
Elle a déjà rendu sa dissertation à sa professeure.
She has already returned her essay to her teacher.
Nous y sommes déjà allés.
We have been there before.
French With a Smile 