摘要：6．一些表示频率的副词(如many a time, often等)位于句首时. I have seen her taking a walk alone many a time. Many a time have I seen her taking a walk alone. 我多次看到她独自一人在散步. She often came to my house in the past. Often did she come to my house in the past. 过去她常到我家来.

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