The following sentence contains ...

The Christian follows Christ's example in serving others.

1: A gerund phrase as the object of a preposition.

2: A dangling participle.

3: A gerund phrase as a direct object.

The following sentence contains a gerund phrase as the object of a preposition. A gerund phrase consists of the gerund (a word in a verb form that functions as a noun) and its modifiers or complements. The gerund in the sentence is the word "serving". It is a gerund phrase as the object of the preposition, because it is introduced by the preposition "in".