He enjoys reading books in his spare time. Here 'reading' is an example of -

• He enjoys reading books in his spare time.
- Here 'reading' is an example of - Gerund & non-finite verb.

• Non-finite verb:
- A non-finite verb is a verb form that does not show tense.
- Most non-finite verbs found in English are infinitives, participles, and gerunds.
- প্রশ্নে উল্লেখিত বাক্যে, 'reading' verb টি কোনো tense নির্দেশ করে না।
- তাই এটা non-finite verb.

• আবার,
- Verb এর সাথে -ing যোগ হয়ে যদি noun এর কাজ করে, তাকে Gerund বলে।
- Gerunds don’t describe the action, they act as nouns.
- The Gerund has the force of a noun and a verb; it is a Verbal noun.
- এখানে ‘reading’ transitive verb এর object হিসেবে বসেছে।
- তাই এটি gerund.