Hello. I will be grateful for some help with English tenses.

1) Are both variants possible: "she has been helping me for years" or "she has helped me for years"?
2)The same question: "they have tried to do it since March" or "they have been trying to do it since March"?
3)Please help me with a lexical question. Is it possible to say "to sharpen the situation" in the meaning of "to escalate the situation"?
Thank you very much for all your help.

1 answer

All of your sentences in 1 and 2 are correct.

We wouldn't say to sharpen the situation, but escalate the situation is fine.
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