如果说这只是个动词不定式短语，那么把这句话写完整后是怎么样的，动词不定式在句子中做的什么成分？
它是插入语，为引起下文用，如
To tell you the truth, I have never seen him since last year.
信不信由你，从去年开始我就一直都没见到他？
To tell you the truth, I have never seen him since last year.
信不信由你，从去年开始我就一直都没见到他？
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