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 answer

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.