Поставьте глагол-сказуемое в следующих предложениях в страдательном залоге, стараясь сохранить время. 1. ? built these houses about 25 years ago. 2. ? must keep the sick child warm. 3. ? has translated Shakespeare's plays into many languages.
1 These houses were built about 25 years ago. 2 The sick child must be kept warm. 3 Shakespeare's plays has been translated into many languages.