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If planets are falling on Earth tomorrow, they won't/wouldn't/shouldn't look as small as a star (today)."

The "if X are doing Y tomorrow...they won't" construction has the most results on Google, so I'm leaning towards won't. Still, I'm not very sure ... is this the correct option? Why?

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  • I think, since in if clause you are using present participle, wont is more logical. (If I had to select one of them, It will be "wont")
    – Cardinal
    Oct 25 '15 at 9:02
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    @Cardinal, "If I had to select one of them, it would be won't". Practice what you preach. Oct 25 '15 at 12:20
  • @VictorBazarov :) At the moment, I feel I'm a stupid learner! However, my intent was , "If I have to ..." thanks BTW
    – Cardinal
    Oct 25 '15 at 14:11
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First conditional, the "if" is in present tense (in fact, it's past-in-future), the main clause needs to be in the respective tense, here (since you talk about "tomorrow") future indefinite. You could use "are going to" since it's near future.

If planets are falling on Earth tomorrow, they won't look as small as a star (today).
If planets are falling on Earth tomorrow, they aren't going to look as small as a star (today).

Second conditional, the "if" is in past tense (expressing less likely scenario), the main clause has "would"

If planets were falling on Earth tomorrow, they wouldn't look as small as a star (today).

Third conditional here is impossible since only first and second conditionals are used when talking of the future.

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