Question

she laughed at the joke . whether transitive or intranstive

Answer 1

As here joke is the object of the verb so it's transitive verb

Answer 2

It is a transitive sentence because it can be changed into passive voice. The sentences which can be changed into passive voice are transitive sentences and those which cannot be changed are intransitive sentences.

The passive form of the sentence mentioned above is The joke was laughed at by her.

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