Core Usage
The word 是 (shì) functions primarily as the copula verb "to be" in Mandarin Chinese. It links a subject to a noun or noun phrase, indicating identity or classification. For example, in "他是老师" (He is a teacher), 是 connects the subject "he" with the predicate noun "teacher".
Common Patterns and Nuances
是 is typically followed by nouns or pronouns, not adjectives or verbs. When expressing qualities or states, other verbs like 很 (hěn) or adjectives alone are used instead. For example, "他很高" (He is tall) does not use 是.
Collocations
- 是 + noun: to identify or define (e.g., 他是学生)
- 是 + possessive phrase: to indicate ownership or relation (e.g., 这是我的)
- 是 + clause (often with 是...的 structure): to emphasize or explain (e.g., 问题是你不努力)
Common Confusion
Learners often try to use 是 before adjectives, which is incorrect. Remember, 是 links to nouns or noun phrases only. For qualities, omit 是 and use adjectives directly or with 很.
Understanding 是 well is essential because it forms the backbone of many basic sentences in Mandarin, establishing clear subject-predicate relationships.