''Hearken! observe how healthily-how calmly I can tell you the whole story.''
''every night, about midnight, I turned the latch of his door and opened it.''
''my thumb slipped upon the tin fastening, and the old man sprung up saying-who's there?''
In this scene, the narrator is telling you that the disease that he had can sharpen his senses. He is saying how acute his hearing is that he has heard all things in Heaven, Earth, and in hell. He is telling you to listen to how well he can you this story.
'' A tub had caught it all.''
In this scene, the narrator goes in The Old Man's room and cautiously sticks his head in the room. Then he carefully undid the latch of the lantern and shined the light on the eye.
''We have been deputed to search the premises.''
What is happening in this scene is that the narrator came into the Old Man's room and his finger slipped making a noise. That woke up the old man. The Old Man would not go back to sleep. Then the narrator hears his heart beating and it irtates him so him flips the bed and kills him.
''They heard!-they suspected!-they knew!
In this scene the narrator had chopped off all the limbs of the Old Man. He had done in the tub so no one would know what happened.
So now police officers are at the door because the neighbors had heard a scream. The narrator let them in and search because he had no reason to be afraid.
Now the police are laughing with him. Then out of nowhere, he starts hearing this noise. Then it gets louder and louder. He gets so annoyed at their hypocritical laughs and tells them that his body is right under where they are sitting.