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I have come across the following construction in which the examiner used the Future Progressive Tense. Isn't it right to use the Future Perfect Tense?

By 2150, the world's population will be increasing to 10 billion.

  • Most people would probably use simple future By 2150, the world's population will increase to 10 billion. Your "continuous" version implies either an "Indian English" source, or a slightly unusual stylistic choice intended to emphasize the fact that continuously increasing global population is an ongoing (past, present, and future) process. On the other hand, a native speaker might well say By 2150, the world's population will have increased to 10 billion to emphasize the fact of reaching a significant "milestone" at that future time, rather than the currently ongoing process. – FumbleFingers Mar 3 '18 at 13:51
  • @FumbleFingers: l really appreciate your reply. It's clear now. – Mido Mido Mar 3 '18 at 14:51
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Grammatically it is not incorrect, but it presupposes a very special context.

The preposition by implies that something will have been completed by that time, therefore the continuous tense is kind of strange.

By 2150, the world's population will have increased to 10 billion.

or

In 2150, the world's population will be increasing to 10 billion.

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