Can anybody help me and write a few quotes from Macbeth about the responsibility of Duncans murder?
Well, you can have a good look at these excerpts:
a) "..........why do I yield to that suggestion
Whose horrid image doth unfix my hair
And make my seated heart knock at my ribs
Against the use of nature?" (Macbeth) [act1 sc.3]
b) " The raven himself is hoarse
That croaks the fatal entrance of Duncan
Under my battlements." (Lady Macbeth) [act1 sc.5]
c) " .............He's here in double trust.
First, as I am his kinsman and his subject,
Strong both against the deed; then, as his host,
Who should against his murderer shut the door,
Not bear the knife myself." (Macbeth) [act1 sc.7]
d) " When Duncan is asleep--
......................his two chamberlains
Will I with wine and wassail so convince,
That memory shall be fume..................
What cannot you and I perform upon
The unguarded Duncan?" (Lady Macbeth) [act1 sc.7]
e) " There's daggers in men's smiles: the near in blood,
The nearer bloody." (Donalbain) [act2 sc.3]
f) " Thou hast it now: King, Cawdor, Glamis, all,
As the weird women promis'd, and I fear
Thou play'dst most foully for 't." (Banquo) [act3 sc.1]
Hopefully, you can find many more.