Can you please check these other sentences,too? Thank you.

1) Every detail in the novel is accounted for in the most precise manner.
2) Friday's physical traits are similar to those of a European.
Friday doesn't believe in God so he is not Christian. Friday is not Christian but he believes in his own God.
3) Robinson has the role to teach him English. Robinson believes that teaching Friday is part of his duties as a colonizer.
4)During a mission of exploration Friday saves the life of Friday, called like that because of the day the savage was saved. (I need to rephrase this sentence)
5)You are never consistent in the use of tenses. Don't switch from the present to the past.
The characters are presented from the inside of the story ("of the story" is not correct?)
6) You wrote a number of incorrect sentences both from the point view of the grammar as from that of the content.
How would you describe the following grammar mistakes: "he feed hisself because he learn how to cultivate the land"?They refer to morphology.
7)He has a very sweet look like a European's.
The author employed first person narration (only) to pretend it to be a true story.

1 & 2 = OK

3) Robinson has the role of teaching Friday English. Robinson believes that teaching Friday is part of his duties as a colonizer.

4)During a mission of exploration, Friday saves his own life. ??

5) OK

The characters are presented from the inside of the story ("of the story" is not correct?) <~~I don't understand this. Do you mean their characteristics are revealed as the story goes on, rather than in an outright description at the beginning?

6) You wrote a number of incorrect sentences both in grammar and usage, as well as in the content.

How would you describe the following grammar mistakes: "he feed hisself because he learn how to cultivate the land"? They refer to morphology.
With "he" as the singular subject, the verb needs an -s ending - feeds.
The word "hisself" doesn't exist -- the word is "himself". The verb "learn" also needs an -s ending for the same reason as above.


7) OK

The author employed first person narration so he could pretend it was a true story.

Sure! Here are the checked versions of the sentences:

1) Every detail in the novel has been accounted for with utmost precision.
2) Friday's physical traits resemble those of a European. Although he does not believe in God, he does have his own personal beliefs.
3) Robinson has the responsibility of teaching Friday English. Robinson considers teaching Friday part of his duties as a colonizer.
4) During an exploration mission, Friday saves a life. Friday is called by that name because he was saved on a Friday.
5) You should maintain consistency in your use of tenses. Do not switch from the present to the past. The characters are presented from within the story.
6) You have written a number of incorrect sentences in terms of grammar and content. How would you describe the following grammar mistakes: "he feed hisself because he learn how to cultivate the land"? These errors are related to morphology.
7) He has a very sweet European look. The author uses first-person narration exclusively in an attempt to make it seem like a true story.

I hope this helps! Let me know if you have any more questions.