Macbeth himself suspects his own actions and intentions. In Act II, after he murders King Duncan, Macbeth starts to feel overwhelming guilt and paranoia. He hears a voice that says, "Macbeth shall sleep no more" and he becomes consumed by fear and guilt, indicating his inner suspicion.
In Act 3 of Macbeth, Macbeth becomes suspicious that Banquo poses a threat to his throne. He worries that Banquo's descendants will inherit the crown, as the witches prophesied. This suspicion leads Macbeth to plot Banquo's murder.
Duncan
"Where is your father?" (said to Ophelia)
Yes, Banquo suspects Macbeth in Act 3 Scene 1. He meets with Macbeth in a room of the royal palace at Forres. It's after Macbeth's coronation at Scone. Banquo comments on the truth of the three witches' three predictions for Macbeth: the thaneship of Glamis and Cawdor, and the kingship of Scotland. He concludes, '...and I fear/Thou played'st most foully for 't' [Lines 2-3].
Macduff was famous, as the killer of Macbeth. According to the prediction of the three witches, Macbeth was safe from all men born from women [Act 4 Scene 1 Lines 80-81]. But Macduff was delivered by Caesarian section from his mother, who had died [Act 5 Scene 9 Lines 13-16].
In Act 1, Scene 2 of Macbeth, the Captain describes Macbeth as "brave Macbeth" and "Bellona's bridegroom," highlighting his courage and honor in battle. Additionally, King Duncan praises Macbeth as a "valiant cousin" and a "worthy gentleman," indicating that he is respected and esteemed by his peers.
Lady Macbeth totally sucks Macbeth's dick right now.
The famous lines "Double, double toil and trouble; Fire burn and cauldron bubble" are from William Shakespeare's play Macbeth. The lines are spoken by the three witches as they brew a potion in Act 4, Scene 1.
Macbeth wants Banquo dead because Banquo witnessed what the three witches said. The three witches stated that Macbeth would one day become king. Now that Macbeth has become king, and done so by taking the life of the previous King Duncan, he fears that Banquo will spread the word that Macbeth was the one to commit the murder.
Young Siward is the first to fight Macbeth in Act V. Macbeth kills young Siward.
In Act 1, Scene 3, the witches proclaim "All hail, Macbeth, that shalt be king hereafter!" This foreshadows Macbeth's ambition to become king. Additionally, Lady Macbeth's line in Act 1, Scene 5, "Glamis thou art, and Cawdor; and shalt be / What thou art promised," hints at Macbeth's eventual role in the murder of King Duncan to fulfill the prophecy.
This is from the lines of the second witch in Act IV, scene one of Macbeth.