1)she seems (to work) at this problem since she came here. 2) he appears (to know) French well. 3) he is said (to spend)

1. She seems to have been working at this problem since she came here. - Кажется, она работает над этой проблемой, с тех пор как она пришла сюда. 2. He appears to know French well. - Он, оказывается, хорошо знает французский. 3. He is said to have spent his youth in Paris. - Говорят, что он провел свою юность в Париже. 4. The enemy was reported to have overthrown the defence and to be advancing towards the city. - Сообщалось, что враг прорвал оборону и продвигается к городу.