宾语从句I don't know _ to visit the old man.A whether B if

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宾语从句
I don't know _ to visit the old man.A whether B if

A
疑问代词whom、what、which、连接词whether（不能用if）、疑问副词when、where、how常常与动词不定式连用,构成一种特殊的动词不定式短语,可以作主语、直接宾语、表语、介系词的宾语等.如：
How to fight pollution is a problem.
It remains a problem how to fight pollution.
I don't know whether to refuse it or not.
The problem was how to cross the river.
This is a book on how to speak with a pure American accent.
希望我能帮助你解疑释惑.

宾语从句I don't know _ to visit the old man.A whether B if I don’t know____ to visit the old man. 宾语从句语法I don't know if ／whether he still lives here after so 复合句练习初中1.I don't know___to visit the old man or notA.whether 1.Is she going to visit the museum?I don’t know.(用宾语从句改写句子). I don't know whether to take the medicine at once.If I _____ I don't know _____ I am free this afternoon.A whether B if 选 if i don't go to the library tommorrow,_ A.neither shall i B I don't know whether you happen ____.A.to be heard B.to be h ③宾语从句中的whether 与or not直接连用,就不能换成if；不直接连用,可换.I don’t know whe If you don't know the way to the hotel,you can ( ) a man and will they have a party?I don't know.(合并未含有if引导的宾语从句的复合句)