I didn't pretend to know him 和 I pretended not to know him 有

I didn't pretend to know him 和 I pretended not to know him 有 I didn’t know what had happened to him 有语法错误吗 英语翻译我不知道怎样教他下棋I didn't know( )( )( )him to play chess. I know of him 和 I know about him 和 I know him 有啥区别 I don't know what___(happen)to him I don't know how to help him同义句 I Don't know how to love him歌词 i didn't know him until last year.=I()know him()last year. I want to know _____ about him Two yeas (以前) ,I didn't know him? I didn't know him well,neither did Jeff.英译汉 I don't know him.