They have known him___to have been arrested_____(arrest) by the police.划线上为什么用不定式的被动语态啊,应该没有know sb to 还有为什么是不定式被动语态的完成时啊，主要是两点：1.为什么是用不定式 2.为

known,how long,have they,each other It s____ that they have known it 同义句转换：It seems that they have known each other .They ___ ___ have known each other .同义句转换：It seems that they have known each other .They ___ ___ have known each other . 同义句转换They have known each other two years. 改成同义句：They have known each other for six years .They have known each other ____six years____. he and she___each other since they were children,so nobody was surprised to hear they were marriedA knew B have known C had known D were known 22.They kept trying _____ they must have known it was hopeless.为什么用WHEN? John and Mary_____each other pretty well before they got married.A.knew B.know C.had known D.have known How long ____each other before they _____ marriedA have they known ,get B did they know ,were going to get C do they known ,are going to get D had they known ,got ( ) they have won the game is known to us.( ) is known to us is ( ) they have won the game.( ) is known to us,they have won the game.( ) is known to us ( ) they have won the game.A.It B.That/that C.What D.As More __,people have known they must protect their living environment.(important)为什么答案是importantly Tom and Peter had known each other since they were little.Tom and Peter have known each other since they were little.请问两句的分别 Should Have Known 歌词 What I have known? Who'd Have Known they have known each other for two years的同义句 they( ) ( ) ( ) each other two years ago They kept trying _____ they must have known it was hopeless.A. if B. because C. when D. where I suppose they have known about it ,( A.am I B.am not I C.have they D.haven't they