If ZAI (在) is viewed as a spacial preposition, it can be translated into prepositions such as “at” or “in.” For example, the phrase “在家” can be translated into “at home.”
If ZAI (在) is a progressive marker, the counterpart in English should be the present ongoing tense. For instance, the phrase “他在讀書” can be translated into “He is reading a book.”
