Mandarin · Chapter 13 · Lesson 9 · Grammar primer
The 是…的 construction
Highlighting the time, place, manner or agent of a known past action: 我是昨天来的, 他是坐飞机来的, 这本书是在北京买的. How it differs from 了 (了 reports that something happened; 是…的 stresses a detail of it), and the 不是…的 negation.
The lesson is a long-form read rather than a flashcard session. Open the primer below, work through it once, then come back and continue with the next lesson.
Read the primer