Obligative
专性的
🗣️ 情景例句
I'm so busy that I don't get around to it.
我忙得找不出时间去做它。
I started school at the age of 6.
我六岁开始上学。
There's no need for that. We'll have dinner another time.
不必为那件事惭愧。我们改个时间再共进晚餐吧。