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n./m. sky; day, daytime; weather; a period of time in a day; god; heaven; used for counting days
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When 天 is used as a noun meaning "day, daytime", it is a nouns of quantity. By noun of quantity, we mean that this noun itself already has a meaning similar to that of a measure word. Therefore, other measure words cannot be used before 天.
For examples:
- 一周有七天。 [phr] One week has seven days.
- 过几天 [phr] in a couple of days, in a few days
We cannot use 个 before 天 in the two examples above. Please remember this, as it is a very common mistake among beginning learners.

Other nouns like 天 include: 岁(sui4, age), 年 (nian2, year), 课 (ke4, lesson, class), etc. Please feel free to check them out if you are interested.
What is the difference between 天 and 日 ?
hagar ebrahim
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