Identifying Subject of the Sentence--- --ing words

Words that end in -ING can be confusing because -ing words can do many things.

Singing is my favorite past-time. (SINGING is the subject of the sentence)
Singing quietly to herself, Ms. Sahli drove away from the ocean. (SINGING is part of the adjective phrase: singing quietly to herself)
The children are SINGING Michael Jackson hits from the 1980's. (SINGING is part of the verb phrase: are singing)

Please type the subject of the sentence. Sometimes the subject will be an -ING word, sometimes not.

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