‘Huffing and puffing, we arrived at the classroom door with only seven seconds to spare’. In this sentence the verb 'arrived' is-

The verb arrived is intransitive, because it takes no direct object. We cannot ask 'what' or 'whom' after it. The phrase 'at the classroom door' answers where.

• Intransitive verb: a verb that does not need a direct object to complete its meaning.
• It is often followed by an adverb or preposition.
• Structure: subject + verb, e.g. The window opened automatically.
• Questions for intransitive verbs are usually asked with when or where.