Russian: Are these "I don't know..." sentences correct? Я не знаю... I don't know... whether or not: читал ли Brian эту книгу. whether Brian has read this book (once) before or not. who: кто читал эту книгу. who has read this book (once) before. what: что Brian прочитал. what Brian read yesterday. when: когда Brian прочитал эту книгу. ...when Brian read that book. where: где Brian прочитал эту книгу вчера. where Brian read that book yesterday. why: зачем Brian прочитал эту книгу вчера. why Brian read that book yesterday. how: как Brian прочитал эту книгу вчера. how Brian read that book yesterday.