of due

例句：

1. 1. He was certainly right about the matter.
   他对这件事绝对正确。
2. 2. She certainly knew how to make a good impression.
   她显然知道如何给人留下好印象。
3. 3. It's undoubtedly true that he is a great writer.
   他无疑是个伟大的作家，这毫无疑问。