Hello. I need some help from a native speaker of English.

1)Is it possible to say "to make a (peace) treaty" or is it "to conclude a treaty"?
2)is it possible to say "to make a visit to Mexico"?
3)is it possible to say "bipartite relations (between the states)" or is it "bilateral"?
4)is it possible to say "to aggravate / to sharpen / to kindle the conflict (between the countries)"?
5)which is correct "to change one's position on the 'issue' / 'question'"
6)is the article necessary in the following phrase "all (the) four islands belong to..."
Thank you very, very much for your help.

1. "To make a treaty" is correct. "Conclude" may be used when you've been writing about the process of making the treaty and ending or concluding the process.

2. Yes.

3. It could be either.

http://dictionary.reference.com/browse/bipartite

http://dictionary.reference.com/browse/bilateral

4. All are correct.

5. Either is correct.

6. The article isn't necessary, but could be used.

Hello! I'm here to help you with your questions.

1) Both "to make a treaty" and "to conclude a treaty" are correct and commonly used expressions. "Make a treaty" refers to the act of creating or forming a treaty, while "conclude a treaty" implies the finalization or completion of a treaty.

2) Yes, it is perfectly fine to say "make a visit to Mexico." However, a more commonly used expression is "to take a trip/visit to Mexico." For example, "I'm planning to take a trip to Mexico next month."

3) Both "bipartite relations" and "bilateral relations" are correct, but "bilateral" is more commonly used. "Bipartite relations" might sound slightly more formal or technical than "bilateral relations," which simply means relations between two parties or states.

4) All three expressions, "to aggravate the conflict," "to sharpen the conflict," and "to kindle the conflict" are correct. They all convey the idea of intensifying or worsening a conflict between countries.

5) Both "change one's position on the issue" and "change one's position on the question" are grammatically correct. The choice between "issue" and "question" would depend on the specific context and the subject matter being discussed.

6) Using the article "the" in the phrase "all (the) four islands belong to..." depends on the context. If there is a specific group or category of islands being referred to, then using "the" would be appropriate. However, if the islands are being mentioned for the first time and there is no specific group mentioned previously, then it is not necessary to include "the."

I hope this helps! If you have any more questions, feel free to ask.