I
noun
BAD : The ring has great sentimental worth.
GOOD : The ring has great sentimental value.
BAD : They do not appreciate the worth of life.
GOOD : They do not appreciate the value of life.
◆◆◆
Worth is usually used as a preposition: 'A four-bedroomed house in the middle of town is probably worth about £200,000.'
The noun related to worth is value : 'The current value of property is very low compared with this time last year.'
Compare: 'That watch is worth fifty pounds.' 'That watch has a value of fifty pounds.'
II
preposition
1
BAD : The missing ring worths about two thousand pounds.
GOOD : The missing ring is worth about two thousand pounds.
BAD : A holiday doesn't worth all the effort it takes preparing for it.
GOOD : A holiday isn't worth all the effort it takes preparing for it.
◆◆◆
be worth £20/very little/a fortune etc : 'These old computers aren't worth much nowadays.'
2
BAD : It's also worth to visit the north of England if you have time.
GOOD : It's also worth visiting the north of England if you have time.
BAD : The museum was certainly worth to see.
GOOD : The museum was certainly worth seeing.
◆◆◆
it's worth doing sth; sth is worth doing (NOT to do ): 'It's worth remembering that these old cars can be very expensive to run.'