Perfective
a. 完成的, 完成时的\\nn. 完成时
🗣️ 情景例句
Keep it. I'm buying tonight.
收着吧，今晚我付钱。
A watched pot(pan) is long in boiling.
心急水不沸；盼得越切，来得越迟。
He was rather elderly with grey hair and clear blue eyes.
他上了年纪，有着灰白的头发和明亮的蓝眼睛。