He enjoysreadingnovels in his spare time. Here the underlined word is -

• He enjoys reading novels in his spare time. Here the underlined word is - Gerund.

• Gerund:
- Verb+ing যদি একই সাথে Verb ও Noun এর কাজ করে, তখন তাকে Gerund বলা হয়।
- Noun হলে সাধারণত বাংলা অর্থে আ-কার যোগ হয়।
- যেমন- Swimming = সাঁতার কাটা, Walking = হাঁটা ইত্যাদি।
- Gerunds don’t describe action, they act as nouns.
 
Functions of the Gerund: 
কোন বাক্যে Gerund ব্যবহৃত হয়: 
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.

• Gerund (verb + ing) verb-এর object রূপে ব্যবহৃত হতে পারে৷
- The gerund "reading" is the direct object of the verb "enjoys."
- Gerunds are verbs that function as nouns. In this case, "reading" acts as the object of the verb "enjoys" and represents the activity that he enjoys doing.