participated

"He is a student of life."

"My friend told me there was something in the box, but I didn't know what it was yet. "

"The divers encountered a huge school of mackerel."

"The children are sharing their toys. "

"Teaching oneself to swim can be dangerous."

"The gardener carefully involved the long hose around the metal post. "

""She helped me with my homework, and I helped others with theirs." "

"He helped his grandfather cook breakfast."

"My discussion with the professor was very enlightening."

"The dancer was wearing Highland costume."

"The teacher gave a good example of a sentence using the past tense. "

"The transfer of the student to a different class was announced in a school memo. "