Big cities will be growing or will have grown by then. In this sentence we use future continuous or future perfect simple.

  • 1
    Could you say what you think is correct and why, please? Dec 26 '20 at 17:33
  • 1
    Is there are particular question being asked here?
    – user19179
    Dec 26 '20 at 18:09

It depends what you are trying to express. There are two possibilities, and the different tenses express those situations:

  • If the cities will be growing in the year 2050, you say The cities will be growing in 2050.
  • If the cities will be bigger in 2050, The cities will have grown by then(2050).

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