I've doubt about な.

I've to use it only when I'm talking in present tense?

Example:

> １）きれいな人だ  
>  ２）きれいな人だった

The second one is valid?

Thanks in advance!
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2018-12-06T08:13:24.020
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2018-12-07T00:29:36.933
2018-12-07T00:29:36.933
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question
na-adjectives
な Adjectives - Only in present tense?