'It is no good falling in love at first sight'. Here the word "falling" is a/an -

সঠিক উত্তর: gerund।

এখানে 'falling' হলো gerund, কারণ 'It is no good/use' এর পরে verb + ing (gerund) বসে। Real subject হলো 'falling in love at first sight'।
Structure: It is no good/use + gerund.

Gerund: verb + ing যা noun-এর কাজ করে।
- Subject: Rising early is a good habit.
- Object: I like reading poetry.
- Object of preposition: I am tired of waiting.
- Complement: Seeing is believing.

Present participle: verb + ing যা adjective-এর কাজ করে, যেমন: The falling leaves are beautiful.

Verbal noun: The + verb + ing + of, যেমন: The writing of a good letter is difficult.