chapter  39
Talking about duration and frequency
Pages 7

Duration phrases can be used to indicate how long an action occurs. To indicate the duration of an action, follow the verb with a time phrase:

subject + verb + duration

Only open-ended actions have duration. Open-ended actions include 买/買 mǎi ‘to shop,’ 学/學 xué ‘to study,’ 看 kàn ‘to look at,’ ‘to watch,’ ‘to read,’ 吃 chī ‘to eat,’ 睡 shuì ‘to sleep,’ 唱 chàng ‘to sing,’ 洗 xǐ ‘to wash,’ etc.