They found hiking in the mountains exhilarating. Here 'hiking' is used as -

• They found hiking in the mountains exhilarating. - Here 'hiking' is used as - Gerund.- প্রশ্ন প্রদত্ত বাক্যে found verb এর object হিসেবে hiking হচ্ছে gerund.• Gerund:- Verb এর সাথে ing যোগ হয়ে যদি noun এর কাজ করে অর্থাৎ Verb ও noun এর কাজ করে, তাহলে তাকে Gerund বলে।- সংক্ষেপে: Gerund = Verb + ing = noun = Verb + noun.- It is a word ending in "-ing" that is made from a verb and used like a noun:- Gerunds don’t describe action—they act as nouns.• Functions of the Gerund: 1. As subject: Rising early is a good habit. 2. As object: I like playing Badminton.3. As an object of a preposition: The old woman is tired of walking.4. As a complement of a verb: Working is earning.