Adjective Congution Question

[Jaagjah]

I understand how to conjugate i-adjectives, but I have a question regarding na-adjectives. Would this be correct: しずかじゃないなひと = Is not a quiet person. Or would I have to put it like this: これはしずかじゃないなひと = This is not a quiet person. Or like this: このひとはしずかじゃない。

For an i-adjective would this be correct: さむくないへや meaning "is not a cold room" or　このへやはさむくない。へやはあつい。さむかった。

Am I all correct with this or making some errors?

[Shaydwyrm]

When you make a な adjective negative using じゃない, you can conjugate it as an い adjective. For your first two examples, these are valid versions:

しずかじゃないひと = A person that is not quiet
これはしずかじゃないひと = This is not a quiet person

As for the rest of your examples, they look correct to me.

[Jaagjah]

Shaydwyrm、ありがとうございます。

[community.japanese]

Jaagjah san,
Konnichiwa.
What Shaydwyrm said is correct.

Shaydwyrm san,
Konnichiwa.
Thank you for helping Jaagjah san.

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