वैसे Verb जिसकी समाप्ति (ending) ing से हो या Verb 4th form gerund कहलाता है निम्न स्थितियों में V4 को Gerund माना जाएगा |

V4+Auxiliary Verb
Main Verb+V4
Preposition+V4
Possessive Adjective+V4
निम्न शब्दों के बाद V4 का प्रयोग किया जाता है to+V1 का नहीं –

Deny, Finish, Enjoy, Busy, Worth, like, Dislike, Detest, Remember.

Examples-

Incorrect – He enjoyed himself to give parties .
Correct – He enjoyed himself giving parties .