Identify the interjection in the sentence: "Wow! That was amazing!"

In the sentence "Wow! That was amazing!", the word "Wow" serves as the interjection. Interjections are words or phrases that express strong emotion or excitement and are often used as exclamations. In this example, "Wow" conveys a sense of surprise or admiration, which is characteristic of interjections.

The other words in the sentence serve different grammatical functions: "That" acts as a demonstrative pronoun referring to something mentioned earlier, "was" is the linking verb indicating the state of being, and "amazing" functions as an adjective describing "that." Therefore, "Wow" stands out as the only word that expresses a spontaneous feeling, solidifying its role as the interjection in this context.