1) Преобразовать следующие предложения из действительного залога в страдательный
Several people saw the accident.

Five countries signed the agreement.

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2) Преобразовать предложения из прямой речи в косвеную 

 He asked, "How will he find it out?"

 'I can show you the collection of mail stamps of my father', he added.

"Please, don't smoke here", said the professor.