For general ability:
* "Pouvoir parler" (formal) - This translates directly to "to be able to speak."
* "Savoir parler" (formal) - This translates directly to "to know how to speak."
For asking permission:
* "Puis-je parler ?" (formal) - This translates to "May I speak?"
* "Est-ce que je peux parler ?" (formal) - This translates to "Can I speak?"
* "Je peux parler ?" (informal) - This translates to "Can I speak?"
For offering to talk:
* "On peut parler" (informal) - This translates to "We can talk."
* "Je peux vous parler" (formal) - This translates to "I can talk to you."
For expressing the ability to speak a language:
* "Je parle [language]" (formal) - This translates to "I speak [language]."
For expressing the ability to communicate:
* "Je peux communiquer" (formal) - This translates to "I can communicate."
The best way to say "can talk" in French depends on the specific situation and the level of formality you want to convey.