Final answer:
The sentence 'It was Jan, my sister's friend, and she wanted to talk to my sister' consists of one subject 'it,' a predicate 'was Jan, my sister's friend, and she wanted to talk to my sister,' and one independent clause. The verbs 'was' and 'wanted' ensure subject-verb agreement.
Step-by-step explanation:
In the sentence 'It was Jan, my sister's friend, and she wanted to talk to my sister,' the subject is 'it,' referring to Jan, and the predicate is 'was Jan, my sister's friend, and she wanted to talk to my sister.' The verb within the predicate is 'was' and 'wanted.' The sentence contains one independent clause, which is a clause that expresses a complete thought and can stand alone as a sentence.
Revisiting the given information, a subject names something or someone, while the predicate contains the verb and provides information about the subject. In this case, 'it,' being the subject, is identified and discussed in the predicate with actions and descriptions, demonstrating subject-verb agreement as it is a singular subject followed by singular verbs. Further, the conjunction 'and' joins two nouns in the subject complement, but this does not affect the singular verb agreement in this sentence.