cat navy 425 I am not sure whether he was at home during that time ... which of the following questions can I ask him ...? Actually, none of them are questions, but you should be able to make any of those statements.
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cat navy 425I am not sure whether he was at home during that time
... which of the following questions can I ask him ...?
Actually, none of them are questions, but you should be able to make any of those statements. However, 4) sounds too sure to fulfill the condition that you are not sure. The 'guess' or 'think' are needed to emphasize this id