Identifying Complement in the Sentence:
- In the sentence "Sanju is a good dancer," the complement is "a good dancer."
- The complement provides more information about the subject "Sanju" by describing his quality or characteristic.

Determining the Function of the Complement:
- In this sentence, the complement "a good dancer" functions as a subject complement.
- It follows a linking verb "is" and describes the subject "Sanju."

Explanation:
- A subject complement is a word or group of words that follows a linking verb and renames or describes the subject.
- In this case, "a good dancer" directly describes the subject "Sanju" and completes the meaning of the sentence.
- Without the complement, the sentence would be incomplete and lack essential information about Sanju's ability.

Importance of Complements:
- Complements are crucial in providing additional information about the subject and completing the meaning of a sentence.
- They help clarify the subject's identity, qualities, or actions, making the sentence more informative and engaging for the reader.
In conclusion, the complement "a good dancer" in the sentence "Sanju is a good dancer" functions as a subject complement, providing essential information about Sanju's quality as a dancer. Complements play a vital role in enhancing the clarity and completeness of sentences.