Fielding a pop fly on a sunny day can be a tricky play.

I'm having a hard time...
I know:
on a sunny day is prep phrase
can be verb
tricky adj
play do
fly noun
is fielding a gerund? would it be used as the subject?

Yes -- you're right about both! Nice!

jkljlk

Yes, "fielding" in this sentence is a gerund. As a gerund, it functions as the subject of the sentence. Gerunds are formed by adding "ing" to a verb and can act as nouns in a sentence. In this case, "fielding" is acting as the noun that describes the action being performed.

Yes, "fielding" in this context is a gerund. Gerunds are verb forms that function as nouns. In this case, "fielding" is acting as the subject of the sentence. It refers to the action of fielding a pop fly on a sunny day, which is being described as a tricky play. So to answer your question, the gerund "fielding" is used as the subject of the sentence.