помогите переделать предложения в passive voice 1. the builders build many new houses every year 2.famous scientist wrote this book hundred year ago 3/ the students wiil listen the lecture on history on monday 4. my friend studies many technical disciplines at the institute

1. Many new houses are bulit every year.

2. This book was written by a famous scientist hundred years ago.

3. The lecture in history will be listened by students on Monday.

4. Many technical disciplines are studied by my friend at the university.

1.  Many new houses are built every year (by the builders)

2.  This book was written by famous scientist hundred years ago.

3.  The lecture on history will be listened by the students  on Monday.

4.  Many technical disciplines are studied by my friend at the institute.