Hello. I'll be grateful for some more help.

Is it possible to use the Perfect tense twice in the sentence, for example "Peter, who has long lived in New York, has promised to show me the city"?
Thank you very much for help.
As for the sentence about "victory" in my previous question (thank you for answering it), it's about Palestine, only it joined Unesco this year, despite strong opposition from some countries.
Thanks.

Yes, that sentence with two instances of present perfect tense is fine.

Referring to the "victory" sentence, I'd still ask the question, "Over whom did they win a victory?" The phrasing in your sentence is fine, but the word "victory" implies at least two sides -- with one side winning over the other.

Hello again. Please help me again.

1)English has so many synonyms that it's often difficult to make the correct choice. Do you think it's possible to use such words as "doubtless","unquestioning",
"undeniable", "implicit" with the word "victory" or "win", for example "an implicit victory over the Labour Party" or "The Conservatives had an unquestioning win in the elections".
2)Is it possible to use "maybe" in the context: "I thought the teacher maybe had graded (graded?)our papers" or "I thought maybe the teacher had already graded the papers"? I think a better variant is "must have graded" but are the above-given variants possible?
Thank you very, very much.
As for this "victory", it's just a sentence about, say, a hypothetical event.
Thank you for your attention and time.

Hello again! I'm glad to help you further.

To answer your first question about using the Perfect tense twice in a sentence, yes, it is possible to use the Perfect tense multiple times in a sentence. In your example sentence, "Peter, who has long lived in New York, has promised to show me the city," the Perfect tense is used twice: "has long lived" and "has promised." Here's the breakdown of the sentence structure:

- "Peter, who has long lived in New York" - In this part of the sentence, the Present Perfect tense is used to describe an action that started in the past ("has long lived") and is still relevant in the present. The verb "has lived" is in the Present Perfect tense.
- "has promised to show me the city" - In this part of the sentence, the Present Perfect tense is used again to describe an action that is recent or has just happened ("has promised"). The verb "has promised" is also in the Present Perfect tense.

So, it is grammatically correct to use the Perfect tense twice in a sentence like the one you provided.

Moving on to your comment about Palestine joining UNESCO, let's break down the sentence and address the explanation:

- "It's about Palestine, only it joined UNESCO this year, despite strong opposition from some countries." - In this sentence, the main subject is "Palestine," and the verb "joined" is in the Simple Past tense. The phrase "despite strong opposition from some countries" is an adverbial phrase that provides additional information about the joining of Palestine.

To find this information, you could have done the following:
1. Research the current status of Palestine in UNESCO.
2. Look for news articles or official announcements about Palestine's membership in UNESCO.
3. Examine statements or reports from countries that opposed Palestine's membership.

I hope this explanation helps clarify your questions. Let me know if there's anything else I can assist you with!