The gerund (or the verbal noun) is the present participle form of the verb (i.e. the -ing form), used as a noun in a sentence. You can use it in all the places that you might normally use a noun.
The gerund can function just like any other noun in a sentence:
1. as a subject: Driving is not easy for everyone.
2. as the complement of the verb be: My hobby is playing darts.
3. as an object after certain verbs: She doesn't like dancing.
4. after prepositions to make a prepositional phrase: She left without saying a thing.
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