Is this grammatically correct: If there's a war between North Korea and the US, the whole world would/will end.
Are both OK?
No, because with "would", the tenses would be mixed. " "is" - present tense and "will" - present tense. "Would" is past tense.
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No, because with "would", the tenses would be mixed. "there's" (or "there is") is present tense and so it should be
"If there's a war between North Korea and the US, the whole world will end."
"is" - present tense and "will" - present tense. "Would" is past tense.