How do you say know that I could speak French in French?

There are a few ways to say "know that I could speak French" in French, depending on the context and level of formality:

Formal:

* Sachez que je peux parler français. (This translates literally to "Know that I can speak French.")

* Je vous assure que je parle français. (This means "I assure you that I speak French.")

Informal:

* Tu sais que je parle français. (This means "You know that I speak French.")

* Je peux parler français, tu sais. (This means "I can speak French, you know.")

More colloquial:

* Je parle français, hein! (This means "I speak French, you know!")

The best way to choose the right phrase depends on who you are speaking to and the situation. For example, if you are speaking to a teacher or someone you don't know well, you would use a more formal phrase. If you are speaking to a friend, you could use a more informal phrase.

Here are some additional tips:

* "Parler français" is the most common way to say "speak French."

* "Pouvoir parler français" means "to be able to speak French."

* You can also use "je sais parler français" to say "I know how to speak French."