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Help the amateur astronomer evaluate a mysterious sighting.
"That strange light in the sky _________________________ to a UFO! On the other hand, it _________________________ a very bright airplane."
The correct answers are might belong and may just be.
Modal verbs like "might" and "may" do not change form for the third-person singular (no "-s" ending on the modal or the main verb). Even when an adverb like "just" is added, the main verb stays in its base form ("be").