Complementizer
n. [语](引导补语分句的) 补语化成分
🗣️ 情景例句
If you drive carefully.
只要你小心驾驶。
I will have done it by the time you come back.
在你回来之前，我会做完它。[将来完成时，表示将完成…，会做完…]
Shall I ask the shopkeeper if I can try it on?
要问问店主是否可以试穿一下？