Which underlined phrases are gerund phrases?

A gerund is a noun formed with a verb ending in -ing.

A gerund phrase always start with gerunds, includes modifiers and often include other objects. In addition, a gerund phrase always functions as a noun, and are always subjects, objects, or subject complements in sentences.

For example,

A healthy lifestyle requires getting regular exercise.

Watching too much television may contribute to depression.  

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