Calanais

I have some questions about attacking and parrying. The implication from the section about splitting attacks (p. 202) is that a melee weapon can normally only attack once per round (unless split with a skill of 100%+). If a shield is used to attack, it cannot also be used to parry that round (p. 219). The section on two-weapon use (pp.224-225) states "Any adventurer using a weapon in each hand may use them for two attacks, two parries, or one attack and one parry." I cannot find anything that addresses the following. (1) Can a character both attack and parry with the same one-handed weapon in a melee round? (2) Can they attack and parry with a two-handed weapon in the same melee round? (3)Is there a section that covers this? (4) If a character using two weapons parries once with each weapon in a melee round, does the second parry suffer a -20% penalty for subsequent parries/dodges? (5) Do the two weapon rules apply similarly for weapon and shield use?