Not a teacher
In my opinion you will never resolve the issue through percentages. You have to develop an intuition by placing them within contexts. Look at it as in the following examples:I have a friend who will always help me. He is entirely reliable
I have a friend who would always help me, but he always has reasons for not having done so.
I have a friend who may very well help me, but I won't put all my eggs in that basket.
I have a friend who may help me, but I'm well advised to also consider alternatives
I have a friend who could help me, if he feels like it or has the time.
I have a friend who might help me, but I don't expect too much of him.
I have a friend who might possibly, conceivably help me. He is my last resort. (here I start praying)
I have a friend who can't help. He is, thus, entirely ruled out.
I hope it helps some.
- For Teachers