A gerund (/ʤerʌnd/) is an -ing form derived from a verb, that acts as a noun, corresponding in most cases to an action or activity.
- Smoking is bad for you
- I like reading
- Olympic sports such as swimming, weightlifting and fencing.
Gerunds can form the head of a gerund phrase. Gerunds can be modified either by adverbs that go after them or adjective in precede them.
- "Running quickly is an advantage." (adverb)
- "Quick running is an advantage." (adjective)
Students often use the base form of the verb instead, e.g. *"I like read books", though sometimes this processing error produces sentences that actually parse, e.g. "I like dance".