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1. _Receiving_: This is the physical act of hearing the sound of language, whether spoken or written.
2. _Understanding_: This is the mental process of interpreting the meaning of the language that has been received.
3. _Responding_: This is the verbal or non-verbal reaction to what has been said or written.
4. _Remembering_: This is the ability to store and recall information that has been heard or read.