we are not sure whether we can persuade him out of smoking.这句话为什么是宾语从句呢?前面的we are not sure主系表不是完整了么?

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we are not sure whether we can persuade him out of smoking.这句话为什么是宾语从句呢?前面的we are not sure主系表不是完整了么?

sure是及物动词