i don't know whom this book i should give to

I don't know whom I should ask(改为同义句）I don't know whom _____ _____. I don't know whom to ask 和I don't know who to ask 的区别? I don't know i should depend on whom.这句话对吗? i don't know whom this book i should give to I don't know. I don’t know whom you should depend on.可以用who作连词吗I don’t know whom you should depend on.可以这样改吗?I don’t know who you should depend on. 貌似这样吧：I don't know whom Lisa is talking to.你说呢? 英语语法问题-请问这里的whom可以省略么?I don't know whom I am competing with. 这里whom应该做的是宾语吧,可以省略? “i don't know you know i don't know I don't know ——— I should bring a present.A.whom B.if C.what I don't know that I can whom to ask for help? 这句话是有语法错误的吧? sorry,I don't know. i don`t know much I don't really know. 英语；I don't know I don't know miss I don't know him. I don't know now