a english learner

They are almost identical. "Able" is usually followed by an infinitive verb; "capable" is usually followed by the preposition "of" plus a gerund. For example, you would say "I am able to swim" or "I am capable of swimming," but you would NOT say "I am able of swimming" or "I am capable to swim."

Both words can also be used directly before the noun they are modifying. You can say "I am an able swimmer" or "I am a capable swimmer."

(By the way, your topic heading should be "an English question," not "a English question." When using the indefinite article, if the word following it begins with a vowel sound, use AN rather than A. You would say "a banana and an apple," "a crow and an eagle.")

Hi~ I could be wrong, however I believe 'able' implies a surety of action while 'capable' implies a maybe or possible failure to follow through/complete tasks??

This is true... "able" often implies more confidence or assertiveness than "capable." "I am able to swim" leaves less doubt about my ability to swim than "I am capable of swimming."