tried in vain to
Trató en vano de poner fin a su debate ardiente.
He tried in vain to end their heated debate.
Dick trató en vano de resolver el problema.
Dick tried in vain to solve the problem.
Ella trató en vano de sonreír.
She tried in vain to smile.
Ella trató en vano de ocultar su temor.
She tried in vain to hide her fear.