I might (be able to) help you.
You may (be able to) get extra money.
You should (be able to) feel this
You re foolish to expect to (be able to) do that.
Is there any meaningful difference between the versions with and without be able to ?
I might (be able to) help you.
You may (be able to) get extra money.
You should (be able to) feel this
You re foolish to expect to (be able to) do that.
Is there any meaningful difference between the versions with and without be able to ?
For the first one there is a definite difference. I might help you sounds very grudging (I might if I feel like it), while I might be able to help you suggests 'I will help you if it is at all possible'.
In the other sentences, again be able to carries an implication of the possibility or capability existing.
Yes, there is a difference.
If you omit the adjective 'able', the statement is no longer about ability.
Taking your first example:
This gives no reason or detail about why you might, or might not give help. It might be entirely down to your random whim, and you are choosing whether to help or not.
This means that the help depends on your ability, or other circumstances that might contribute to that ability. It implies that if you can help them, you will.