Question

In the following sentence, identify the participle and the word the participle modifies. The child standing in the corner looks unhappy

Answer 1

Participle: Standing

Word Modified: Child

Answer 2

Participles are verb forms which look like verbs + suffix -ing. So having that in mind, the participle in the sentence above is the word standing.
Participles function either as adverbs (when they modify verbs), or as adjectives (when they modify nouns). In this case, the participle acts as an adjective, modifying the word child.