
Hi Norwolf I am not a native speaker but this is what I reckon. this beach isn't going to exist anymore). However, if option 4 was 'won't exist', then it would work as well.
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norwolfCould you native teachers please give me a hand?For the purposes of this test question, you were expected to know that the verb exist is a 'non-progressive' verb, that is, it can't be used in progressive tenses. That definitively eliminates 4, which is 'future progressive'. Only 2 is correct.