[未来] will, may, mightの強度順

助動詞の「かもしれない」可能性の順
could < might < may < can < should/ought to < would < will < must

▼ だいたいこんな感覚 (100% = 確実)

will (100%)
probably will (80%)
may (50%)
might (30%)
probably will not (10%)
will not (0%) ⇨ notがつくと、willの真逆で0%になる

▼ probablyの位置

You will probably enjoy this book.

You probably will not enjoy this book. 

could / might / may ⇨ 未来で可能性ありそう＆確証はない
will / will not ⇨ 確証ある
probably で will / will not の強度が弱まる 

▼ 助動詞の「かもしれない」の例文

▼ その他の「かもしれない」やつまとめ

ほぼ100％
always, must, clearly, evidently, obviously, hundred to one, absolutely, certainly , It's a given that, definitely, without any doubt, surely, Ten to one, completely, quite

90%
very likely, most likely, will

80%
probably, probable, would

60-70%
suppose, presume, I expect that～, should, ought to, can (should/ought to > can)

50-60%
likely, may well, may (may well > may)

40-50%
perhaps, might well, might (might well > might)

10-40%
possibly, unlikely, could

数%
almost never, hardly, scarcely

0%
never, certainly not, I am certain that it will not～, There's no possibility for～