) is involved as in statements #1 & 4 above. The meanings of #2 & #3 are different. In #2, she doesn't know where the motorbike is.
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Thinking SpainThe old lady told him if he had knocked.The above sentence is the only one that is grammatically wrong. You could say: The old lady told him that he had knocked, but I'm not sure there are many situations in which it would make sense. A person usually knowswhether he has knocked or not!