Here's how it's formed:
* Have/Has: The auxiliary verb "have" or "has" is used depending on the subject (I/you/we/they = have; he/she/it = has).
* Past Participle: The past participle of "speak" is "spoken".
Examples:
* I have spoken to the manager about the problem.
* She has spoken at many conferences.
* We have spoken about this before.