It's worth it

[sara88]

hi dear friends,
I'm confused with the use of this expression, "it's worth it", I mean does the pronoun IT changes according to what it replaces or always stay the same in all situations? ex: This book is expencive but it's well worth it.
does IT in this sentence refers to book?
Thank you in advance.

[sara88]

Would you please answer my question? I really need it.
Thank you in advance.

[Anglika]

hi dear friends,
I'm confused with the use of this expression, "it's worth it", I mean does the pronoun IT changes according to what it replaces or always stay the same in all situations? ex: This book is expencive but it's well worth it.
does IT in this sentence refers to book?
Thank you in advance.

Which "it" are you referring to?

If the second "it" - it is worth it - in your example it is referring to the fact that although it is expensive, the cost is not important as the book is valuable.

Learning English is hard work, but it is worth it to find a better job. >> it is worth all the hard work in order to find a better job.

The journey took a long time, but it was worth it in order to see Fujiyama >> it is worth the time spent on the journey in order to see Mt Fuji.
The book was expensive, but it was worth it. >> It was worth paying a lot of money for the book.

[sara88]

Thank you very very very much Anglika, now I got it .