Đâu là sự khác biệt giữa consistent và constant ?Hãy thoải mái đưa ra các câu ví dụ nhé.

Those are good questions! They are very similar words, and some people do use them to mean the same thing. In your example with the library, they are almost the same.

But now that I think about it more deeply, "constantly" is only about the quantity of the action, while "consitently" shows quantity and quality.

To make another example, let's use exercise.
Someone who exercises constantly is doing exercise at all hours. They only stop to sleep.
Some who exercises consistently may exercise every day, but not all the time. They have more diligence and always achieve their goals.

If we go back to your example, the student who studies constantly only takes breaks to use the toilet and sleep. The quality may not always be good, but the studying is always happening. The student who studies consistently takes breaks to eat, sleep, and take walks. But when they study, it is always the quality they planned for.

Constant is good, but consistent is better.

Please let me know if my examples are unclear. I can try to come up with more.