Forum:Priority in main phases?

What do I have the priority to do during the start of the main phase? I think I have priority to normal summon or use a Spell speed one card. Do I have priority to do things such as activate the ignition effect of Breaker, or Any others?

Do I have the priority to do these things during the start of my main phase 2?24.193.90.151 (talk) 16:53, August 29, 2010 (UTC)