### Gerunds in English: Concept, Examples, Structure
#### Concept:
A gerund is a verbal noun that is derived from a verb by adding "-ing." It functions as a noun in a sentence while retaining some characteristics of a verb. Gerunds can be the subject of a verb, the object of a verb, or the object of a preposition.
#### Structure:
Gerunds are formed by taking the base form of a verb and adding "-ing." For example:
- **Verb:** to swim
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