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Modal verbs of probability: must, could, might
source: Crown Academy of English     2014年2月6日

source: Learn English Lab       2016年6月22日

MAY HAVE, MIGHT HAVE for Past Possibility 
source: Learn English Lab      2016年5月29日

How to use modals of deduction and speculation 
source: BBC Learning English           2015年8月11日

Using 'Will', 'Might' and 'Would' 
source: Oxford Online English       2014年3月3日
The full lesson (with text and exercises): http://www.oxfordonlineenglish...

Modal Verbs - May, Might, Could, Can - Talking About Possibilities
source: Oxford Online English       2018年3月23日
1) How to use 'can' to talk about general possibilities in the present or the future.
2) How to use 'could', 'may' and 'might' to talk about specific possibilities.
3) The difference between general and specific possibilities, and when you need to use 'can' or 'could/may/might'.
4) Talking about possibilities in the past using 'could have', 'may have' or 'might have'.
5) The two different meanings of 'could have'—'could have' can be used in two different ways to talk about possibilities in the past, depending on whether you know what happened or not.