1.
Говорили, что она живет здесь.
It was sad that she …
They sad that she …
She was sad to live here.
Indefinite infinitive – одновременность действия со сказуемым и будущность
2.
Сообщают, что она уехала.
She is reported to have gone.
perfect infinitive – предшествование
3.
Известно, что он работает над важным исследованием.
He is known to be working at some important job.
continious infinitive – длительность
4.
Предполагается, что они исследуют это уже два года.
They are believed to have been working at this problem for 2 years.
С глаголами seem, appear, turn out, happen, prove
Сказуемое с этими глаголами употребляется в Active voice.
Money just doesn’t happen to interest me.
He happened to be at the theatre = It so happened that he was at the theatre.
He seemed to be tired yesterday.
He seems to have done the wrong thing.
to be sure (certain) to …
He is sure to come.
Он наверняка придет.
He will surely (certainly) come.
to be likely (unlikely) to …
He is unlikely to come.