Mandarin · Chapter 4 · Lesson 5 · Grammar primer
Classifiers (measure words)
个, 岁, 年, 天, 只, 本, 口 and friends. The rule that every counted noun needs one, and the 这个/那个 demonstrative + classifier pattern.
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