1) Poe believed that the greteast art was that which had to do with emotions.

Thus, the subject matter of many of his tales deals with (??) living corpses, frightening experiences and with situations which the reader has never encountered before (?)
2)Poe's storied are never set in some recognizable place in the present time. On the contrary (?), they are set either in some unknown place, or else (?) in some romantic castle on the Rhine, or in an abbey in some remote part of England, or else during the period of the Spanish inquisition
3) The Romantic (Romantics) felt that the common and the ordinary had no place in art. They believed that art should be deprived of any didactic purpose.
4) As a Romantic (?), Poe ranked poetry as (is "as " correct) far superior to prose-writing and worked out a theory about (or on) the unity of effects, which he applied (?) not only to his poems but also to his tales
5)All the elements that make up (?) a story or a poem are to be invented to create this effect which must be conceived beforehand. Its function (is there a better expression?? It aims at ...) is to strike the reader making him virtually prisoner inside the work itself. Fear is the effect he chose for many of his stories.
6)Can you also say: The ghost pleads with Hamlet to pity Gertrude???
7) Hamlet has allowed his passion for revenge to slip away. (what is a synonym for slip away??)
Thanks

1) Poe believed that the greteast art was that which had to do with emotions.

Thus, the subject matter of many of his tales deals with (??) living corpses, frightening experiences and with situations which the reader has never encountered before (?)
Simplify! Poe believed that the greatest art is associated with emotions. Thus, his tales included living corpses, frightening experiences, and previously unencountered situations.

2)Poe's storied are never set in some recognizable place in the present time. On the contrary (?), they are set either in some unknown place, or else (?) in some romantic castle on the Rhine, or in an abbey in some remote part of England, or else during the period of the Spanish inquisition
Again - simplify: Poe's stories are usually set in commonly unknown places, such as a romantic castle on the Rhine or an abbey in a remote part of England.

3) The Romantic (Romantics) felt that the common and the ordinary had no place in art. They believed that art should be deprived of any didactic purpose.
Romantics = plural -- which fits with the rest of your sentence ("they" and plural verb forms).

4) As a Romantic (?), Poe ranked poetry as (is "as " correct) far superior to prose-writing and worked out a theory about (or on) the unity of effects, which he applied (?) not only to his poems but also to his tales
"Romantic" is fine; keep "as"; delete "-writing"; keep "about"; period at the end of the sentence.

5)All the elements that make up (?) a story or a poem are to be invented to create this effect which must be conceived beforehand. Its function (is there a better expression?? It aims at ...) is to strike the reader making him virtually prisoner inside the work itself. Fear is the effect he chose for many of his stories.
Simplify: All the elements that make up a story or poem need to create a specific effect. Its function ...

6)Can you also say: The ghost pleads with Hamlet to pity Gertrude???
Yes, you can, but why change what you already wrote; it was fine.

7) Hamlet has allowed his passion for revenge to slip away. (what is a synonym for slip away??)
You don't need a synonym for "slip away." It's perfect for this concept.

1) Yes, Poe believed that the greatest art was that which evoked strong emotions. This is evident in many of his tales, which often deal with macabre themes like living corpses, frightening experiences, and situations that the reader has never encountered before. To find examples of these subjects in Poe's tales, you can read his works such as "The Tell-Tale Heart," "The Fall of the House of Usher," or "The Masque of the Red Death."

2) That's correct, Poe's stories are usually not set in recognizable places in the present time. Instead, they are often set in unknown locations or in romantic settings such as castles on the Rhine or remote English abbeys. Another common setting in Poe's works is during the period of the Spanish Inquisition. Some examples of these settings can be found in his stories like "The Pit and the Pendulum" or "The Cask of Amontillado."

3) You are right, the Romantics believed that the common and ordinary had no place in art. They believed that art should be free from any didactic (educational or moral) purpose. Instead, they emphasized individuality, imagination, and intense emotions in their works. Poe was considered a Romantic writer and shared these beliefs.

4) Yes, as a Romantic writer, Poe regarded poetry as far superior to prose-writing. He developed a theory about the unity of effects, which he applied not only to his poems but also to his tales. This theory aimed to create a specific effect on the reader, which he believed should be conceived beforehand. This can be seen in Poe's works such as "The Raven" or "Annabel Lee."

5) The elements that make up a story or a poem are indeed invented to create a specific effect, which must be conceived beforehand. Poe's goal was to strike the reader and make them feel almost trapped inside the work itself. Fear was an effect that Poe often chose for many of his stories. Other effects he utilized include suspense, melancholy, or a sense of the grotesque.

6) Yes, you can say "The ghost pleads with Hamlet to pity Gertrude." This sentence conveys that the ghost of Hamlet's father is asking Hamlet to feel compassion towards Gertrude, who is Hamlet's mother and the ghost's widow.

7) A synonym for "slip away" in the context of allowing something to be lost or fade away could be "elude" or "evade." So, you could rephrase the sentence as "Hamlet has allowed his passion for revenge to elude him" or "Hamlet has allowed his passion for revenge to evade him."