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When do intransitive verbs not have to follow prepositions?

When intransitive verbs don't need to take objects, they don't need to add prepositions.

For example, laugh.

They are laughing. They are laughing.

They are laughing at me. They are laughing at me.

Adverbials are used to modify verbs, not objects, and objects are recipients of actions.

Adverbials and objects are related to verbs, but they are not the same thing.

For example, they laughed at me at the door. They laughed at me at the door. Me is the object and at the door is the adverbial.

That's it ~