Let's analyze each sentence to identify the bolded words or phrases as modifiers, subjects, or objects.
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Mrs. Wong was surprised to find a talking snowman standing outside the ice skating rink.
- Subject
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Watching videos of baby pandas inspired Harry Potter to join his school's environmental club.
- Subject
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No matter what Harry Potter tries, he can't stop his dog from snoring.
- Subject
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Singing in his school choir was Pumbaa's first taste of performing in public.
- Subject
Now, let's categorize the sentences:
Subject
- Mrs. Wong was surprised to find a talking snowman standing outside the ice skating rink.
- Watching videos of baby pandas inspired Harry Potter to join his school's environmental club.
- No matter what Harry Potter tries, he can't stop his dog from snoring.
- Singing in his school choir was Pumbaa's first taste of performing in public.
Modifier
- (None in this set of sentences)
Object
- (None in this set of sentences)
Since all the bolded phrases in these sentences are subjects, there are no phrases that fit the categories of modifier or object in your provided sentences. They can all be placed in the "Subject" column.