may/might

Why can "might" be used within a future statement if it stands for the past tense conjugation of "may". For instance,

"trolls might invade the question"...

That phrase was passed to me by a native English speaker.

While doing a search, I came across a website which stated both words can be perfectly used in a future statement depending on the confidence of a particular event to happen. For instance:

"you might fall off the tree" - not 100% confident the subject will fall off the tree

"you may fall off the tree" - 100% confident the subject will fall off the tree.

Thanks in advance,

Ralph (Spanish)

They are interchangable. However, "may" can also mean "are permitted".

because "might" is subjuntive in "You might fall off a tree"

it's like using "could" (also a past tense in the indicative) with a subjuntive mood, as in "You could fall off a tree"

next fraign (question) please