Давайте преобразуем каждое из предложений в пассивный залог. Пассивная конструкция подчеркивает действие и его получателя, а не исполнителя. Вот пошаговые преобразования:
They will build a new bridge next year.
A new bridge will be built (by them) next year.Brian Brody directed the ultimate space adventure.
The ultimate space adventure was directed (by Brian Brody).Pierre Matie will design her costume.
Her costume will be designed (by Pierre Matie).Someone found my wallet.
My wallet was found (by someone).One of the students broke your window.
Your window was broken (by one of the students).They will deliver my computer on Monday.
My computer will be delivered (by them) on Monday.Mary invited Paul to her birthday party.
Paul was invited to Mary's birthday party (by Mary).British astronomers discovered a new planet.
A new planet was discovered (by British astronomers).
Таким образом, при преобразовании предложений в пассивный залог важно сохранить смысл и уточнить субъект, если это необходимо.