Forum:Question about response

I was once under the impression that I can activate my spell speed 2 or 3 cards at any time during my opponents turn but now I don't think that's correct. Please give me some clarification. Example: My opponent summons a tuner while he already controls a monster. Do I: A. In response to the summon activate book on his tuner? or B. Wait until he declares that he is going to syncro summon and then book the tuner?

Declaring a syncro summon does not start a chain so can you chain to it or do you have to wait until it's summoned and the turn asks for your response?

Thanks68.179.243.64 (talk) 14:00, November 11, 2011 (UTC)