like: He spent hours trying to repair the clock. → →
2127
He spent hours trying to repair the clock. ☊ 
Anh ta mất nhiều giờ cố gắng sửa cái đồng hồ. ☊ He spent hours trying to repair the clock. ☊ Anh ta mất nhiều giờ cố gắng sửa cái đồng hồ. ☊