So, if you declare a Parry for the round, then THAT is your attack for the round
So, even if you declare parry or dodge for this round, you'll get a chance to strike with, f.i., 2H sword? Did I caught it well? On the other hand - imagine such a situation - you have struck in this round for 5AP (again 2H sword) and lack of AP. ZERO AP till the end of this turn. Can you attack (parry it's Combat Move)? I grasp it in this way.
No, if you declare a Dodge or Block/Parry as your action for the round, you do not get to make an additional "strike", that is your "attack" for the round. And if you have already resolved an attack, you cannot go back and Dodge or Parry afterwards.
Please note our earlier comments about Fighting Defensively (which reduces your Attack Bonus and ups your DEF), Fighting Defensively lasts for the ENTIRE round, so if you move 4 points out of AB to get a +2 DEF, that lasts for the whole round, not just during your strike.
Once you have performed your Declared Actions, you cannot go back and declare/perform more actions if you have no Action Points available. (i.e. you cannot make a Basic Strike using a 2-hand sword and then later in the round decide you want to perform a parry, as you have no AP to use in declaring that new action).
The only, sort of, exception to this is if you declare your attack, but before you actually get to perform the attack, you specifically "Cancel your Action" (page 43), which means you are not going to complete that declared strike. In cancelling that action, you have a limited list of alternative actions that you are allowed to perform, and that limited list includes Dodging and Parrying.