We often use a negative question like “Isn’t this…?” or “Aren’t you…?” in conversation. Technically, these are not questions for asking something. They are a casual and friendly way to confirm something or make a suggestion.
For example, if you and your friend are at the peir on a sunny day, you might say:   “Isn’t this a perfect day for fishing?”  You’re not really asking for information — you’re confirming what you already think. OR "Aren't these donuts delicious!”
Or if you’re making a suggestion, you can use the same pattern. Like:  “It’s almost 5pm. Isn’t it better to take the subway?”  Here, you’re giving your suggestion in the form of a question. Here’s another one. “The exam is a week away. Shouldn’t you start studying?”
So remember, negative questions like “Isn’t it…?” and “Aren’t you…?” are great for confirming ideas or suggesting something in a very natural, conversational way. “Isn’t that interesting!” So, aren’t you gonna try to use this kind of English in your conversations?

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