like: Anh ấy đang ăn kem. → →
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He's eating ice cream. ☊ 
Anh ấy đang ăn kem. ☊ 701
He was eating ice cream. ☊ Anh ấy đang ăn kem. ☊ He's eating ice cream. ☊ Anh ấy đang ăn kem. ☊ He was eating ice cream. ☊ Anh ấy đang ăn kem. ☊