zài
in
The Chinese word '在' is used to express the state or action of being located in a place or exact location. It is equivalent to the English preposition 'in'. The word '在' is also used to indicate an action that is currently happening, similar to the English present progressive tense (e.g., I am doing something).
Wǒmen zài gōngyuán sànbù.
We are walking in the park.
Here, '在' is used to indicate the location of the action (walking), which is taking place within the park, providing context for the activity.
Tā zài jiālǐ xiūxí.
He is resting at home.
In this example, '在' describes the location where he is resting, which is at home, giving the listener a clear picture of where the person is during the action.