How do you say the best teacher I have ever had in French?

The most direct translation of "the best teacher I have ever had" in French is:

Le meilleur professeur que j'ai jamais eu.

Here's a breakdown:

* Le meilleur: The best (masculine singular)

* professeur: Teacher

* que: That

* j'ai: I have

* jamais: Ever

* eu: Had

You can also use a more emphatic phrase:

C'est le meilleur professeur que j'ai jamais eu.

This literally means "It's the best teacher that I have ever had." This emphasizes the fact that you consider this teacher to be the best.

Finally, you could use a slightly more formal and appreciative phrase:

Le meilleur professeur que j'ai eu le privilège de connaître.

This translates to "The best teacher I have had the privilege of knowing." It emphasizes the honor you feel in having this teacher in your life.