Infinitival
a. 不定式的
🗣️ 情景例句
Well, I know you and Mom have given up a lot
嗯， 我知道你和妈妈省吃俭用
He is studying the ecology of ameba.
他在研究阿米巴
Last Sunday I got up very late.
上个星期天，我起得很晚。