Try these phrases:
It isn't mine.
It isn't yours.
It isn't good.
Isn't it ready yet?
Isn't it online?
Isn't it here?
Americans almost always use "isn't" rather than saying is not. It isn't informal, and in fact if you use "is not" you might sound stiff, hostile, or argumentative. That's because we usually only say "is not" if we are clarifying or arguing.
Add your own phrases starting with "it isn't" and "isn't it."
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Find your target sound. Listen to the words. Repeat each word until you are confident in your pronunciation. Use your recording tool to record the sample and your word. Playback and compare. Repeat until your production matches the sample.