February 22, 2010 9:11pm CST
Sentence with shi4 as the predicate are known as shi4 sentences.The basic pattern is:
Subject +shi4+object
Examples:
ni3 shi4 wo3 de hao3 peng2 you.
san1 jia1 wu3 shi4 ba1.(3+5 shi4 8)
shi4 in a shi4-sentence may indicate various meanings.