Must I be here tomorrow? I asked him.

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Must I be here tomorrow? I asked him.
合并成一句. I asked him _____ I must be here tomorrow.
那里为什么要填if?
还有一句: "Have you bought the ticket?" asked the conductor.
同义转换成 The conductor asked me ____ I ______bought the ticket.
为什么那里填 if 和 had?
请详细点.或者说明要看哪方面的语法知识! 谢谢~
就是为什么不用whether 呀?

if
我问他是否我明天必须到那儿.是否用if,如果用whether要和not连用.
if..had
售票员问我是否我已经买了车票.
他问我用的是过去时,那我买票应该是在他问我之前,用过去完成时

Must I be here tomorrow? I asked him. will you be here tomorrow?she asked him I asked him what () I asked him to--- I must be he here before7：30,NEEDNOT I This time tomorrow I will be waiting for you here. I asked him ( ) with us. I asked him to () me Surprised,I asked him why. Will Jack leave here tomorrow Yes.I hope I can see him a i see you on . so u must be in here I feel it an houor __(ask)to speak here?be asked 还是asked?