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swapanMy question is - why in sentence no. 1 'of' follows 'is' I mean put 'of' after 'is' and why 'of' doesn't follow 'is' in sentence no. 2 .
That's just the way English is.
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We say "It is of no use to" when we add the person(s) that it's useless to.

It is of no use to me. / It is of no use to you. / It is of no use to children. / It is of no use to the team.
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We say "It is no use" or "It's no use" when we add a clause with an -ing verb to show an action. We omit "of".

It's no use trying to help them. / It's no use speaking English. / It's no use buying that.

CJ
Comments  
Which one is correct?

Must be watch?

or

Must be watched? *with letter e.d
AnonymousWhich one is correct?Must be watch?orMust be watched? *with letter e.d
Must be watched
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I think it distances the attachment of,from the no. Meaning .. of is from the no.

It's no use speaking English. Well said bro

The answer to every grammar related question in a nutshell.

be (of) no use (to somebody) | meaning of be (of) no use (to somebody) in Longman Dictionary of Contemporary English | LDOCE (ldoceonline.com)

be (of) no use (to somebody)to be completely useless You needed blankets to keep warm because the heating was no use. Take this – it’s of no use to me anymore.

• But a sleek sailing boat that spends all its time in harbour is no use to anyone.• She knew that it was no use offering to make it: it would only make Bella angry.• It is of no use to put forward a partial plan for the revitalization of our education.• It was of no use if they received the sacrament of Matrimony and did not live as Christians.• But these models are no use to Clinton.• But there was no use brooding on it: the full story would never be known now.• But all this was of no use to Bowman.• Photographic film cameras on satellites would be of no use until the means of recovering film capsules from orbit could be developed.

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