Perfective aspect
完成体
🧩 词语组成解析
a. 完成的, 完成时的\\nn. 完成时
🗣️ 情景例句
I can't answer that one.
我回答不出那个问题。
They had to cut down a lot of trees to make room for farms.
他们为了为农场增加空间不得不砍倒很多树。
Have you taken your medicine today?
你今天吃药了吗？