Indefinitive
a. 非决定性的, 不明确的
🗣️ 情景例句
I have just begun to learn and my serve isn't very good.
我刚刚开始学习，发球不太好。
It's a poor heart that never rejoices.
不知人间有乐趣者最可怜。
I think I failed the French paper.
我想我的法语及不了格，我能回答