Yes, some verbs can be both transitive and intransitive, depending on how they're used.
Mostly, "volunteer" is an intransitive verb:
She volunteers at the local homeless shelter.
This Girl Scout troop volunteers at a nearby nursing home, mostly reading to the most elderly patients.
He volunteered to help clean up people's houses after the floods.
Sometimes it's used as a transitive verb, but this is far less frequent:
This teacher volunteered her class to pick up trash on the playground once a week.
1. She volunteered to help the children.
[Is 'volunteered' a transitive verb or an intransitive verb? In the long man dctionary, I saw "Transitive or Intransitive." What does it mean? Can 'volunteer' be a transitive verb or an intransitive verb?]
From the Longman dictionary:
volunteer2 ●●○ AWL verb
1 [intransitive, transitive] to offer to do something without expecting any reward, often something that other people do not want to do
volunteer to do something
Helen volunteered to have Thanksgiving at her house this year.
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