1.2: We meet Duncan as he demands that a bloody Captain give him news of how the battle is going. He is full of praises for all that have fought, especially Macbeth and Banquo. He announces that Macbeth has earned the title that the Thane of Cawdor gave up by his treachery.
1.4: Duncan asks if Cawdor has been executed, and notes that it's impossible to figure out whom to trust, as a kind face often hides an evil mind. Duncan then meets Macbeth and Banquo, and is full of gushing praises and thanks for everyone, especially Macbeth and Banquo. He names his son the next in line to the kingship, not knowing this will only spur Macbeth to murder him.
1.6: Duncan arrives with his sons and noblemen to Macbeth's castle at Inverness, and is full of praises for what a lovely place the castle is. At meeting Lady Macbeth, Duncan says he loves her, citing this love as the only reason he would trouble her by being her guest tonight. He professes to love Macbeth, too. This is the last we see of Duncan before his death.