time when...

【模仿1】我还记得这对他来说是一个艰难的时期，他遭受到了身心的打击。

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答案：I can well remember it was a hard time when he suffered a lot physically and mentally.

【模仿2】在中国历史上,曾经有过一段时期中国鼓励与世界其他国家进行贸易。

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答案：In Chinese history, there was a time when China encouraged trade with the rest of the world.

3. 【原句】It was the first time in a year and a half that I'd seen the night face to face. 这是我一年半以来第一次目睹夜晚。

[模仿要点] 句子结构： It is/was the first (second...) time that sb + 现在完成时/过去完成时：这是某人第几次做某事

【模仿1】这是我们第一次面对面地谈论到这件事情。

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答案：It is the first time that we have talked about this issue face to face.

【模仿2】这是他第二次参与怎样解决这个问题的讨论。

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答案：It was the second time that he had joined in the discussion about how to do with the problem.