I left out these other two sentences. Thank you very much.
I need to fix sentence 2 using linkers.
1) From the ship Robinson takes paper, ink and a pen, which he uses to write a diary necessary for Robinson to mantain an ideal contact with his motherland.
2) Robinson has many advantages over Friday: a technical advantage since Robinson has weapons and more sophisticated utensils, a linguistic advantage, since Robinson teaches Friday enough English to undertand his language and, finally, a cultural advantage. Actually, Robinson gives him a new name which recalls the Indian debt to the white man.(correction: which should remind Friday of his debt to Robinson).
1. This should be two sentences -- two different ideas are at work here.
2. semicolons after "utensils" and "language"
correction is good
To connect the ideas in sentence 2 using linkers, you can use the linker "not only... but also."
Here's the corrected sentence:
"Robinson has many advantages over Friday, not only a technical advantage since he has weapons and more sophisticated utensils, but also a linguistic advantage as he teaches Friday enough English to understand his language. Finally, Robinson has a cultural advantage, giving him a new name that should remind Friday of his debt to Robinson."
This correction helps to establish a clearer flow of ideas, using the "not only... but also" structure to highlight the different advantages Robinson has over Friday.