Infinitival
a. 不定式的
🗣️ 情景例句
That'll be fine.
就这样说定了。
To know the disease is half the cure.
找出病根等于治愈了一半。
I'm sorry, I don't know. You'd better ask that policeman.
对不起，我不知道。你最好问问那位警察。