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I have learned that 'can' and 'be able to' are interchangeable for the same meaning sometimes.

I can speak English. VS. I am able to speak English.

Do native English speakers feel any difference between the two or none? Thank you so much as usual and have a good day.
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AnonymousDo native English speakers feel any difference between the two or none?
I feel none except that 'can' is much the commoner.
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anonymousI have learned that 'can' and 'be able to' are interchangeable for the same meaning sometimes.
I can speak English. VS. I am able to speak English.
Do native English speakers feel any difference between the two or none? Thank you so much as usual and have a good day.

My opinion as below:

"be able to" ( use for showing to skill or ability such as language communication skill).

"can" (use for represent a procedure or method to make something such as I can open a can with antique machine.) . This is my understanding.