Question

Is the underlined word in the sentence a participle or verb.she was laughing at every joke her brother told. laughing is the underlined word

Answer 1

I believe it's a participle.

Answer 2

It is in verb tense. She was laughing at every joke her brother told.

She is your subject.

What is she doing? Laughing. That's your verb

Laughing at/to whom or what?

Joke. That is your direct object.

Who had/told the joke? her brother. He is predicate nominative.

Just because it doesn't end with "LY" doesn't mean it's not a verb.

Very glad I could help!