Salmon actually <u>swim</u> up rivers—intransitive verb
Verbs are words that indicate some type of action, feeling or existence in a sentence. They give the information about what the subject is doing.
The Cambridge Dictionary describes a transitive verb as the kind of verb that requires “having or needing an object.” These can be changed into passive voice.
Merriam-Webster Dictionary describes an intransitive verb as the kind of verb that is “characterised by not having or containing a direct object.” These verbs do not form a passive voice.
Example of intransitive verb:
The old lady felt tired.
Learn more about intransitive verb here
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