he seems to be sick为什么要加to be?

he seems to be sick为什么要加to be? he seems to be very busy.是不是主系表结构 He seems to be a teacher 同义句 He seems to be a teacherd的同义句 he seems to worried, there seems to be He seems to be worrying about it.He seemed to be worrying about it.两句都对吗? with a problem to solve,he seems to be in trouble.这句话为什么是to solve.而不是 to be solved.麻烦请详细讲解下.谢谢 英语翻译seems possible that he will wim the match.请问：He seems to be able to win this game. He seems to be a teatherSo he is.还是So he does? 英语句中,He seems to be happy with me 句中,to be be sick to death 意思 to be sick of sth. to be sick with anxiety he seems unable to understand you ,he seems unable to understand you ,be unable to do sth的be在哪,seems 前后有漏什么吗,seems 后是加什么的, he seems to be a doctor同义句it( )( )he( )a doctor He seems to be a doctor.(改同义句）It --- ---- he --- a doctor. he seems to be angry with the girlIt ___ ___ he is angry with the girl