Oughtness
有义务的状态
🗣️ 情景例句
My boss is a slave driver.
我的老板指使我们像指使奴隶似的。
If it doesn't rain tomorrow, we'll have a picnic.
如果明天不下雨，我们就去野餐。
it would be up and down, to and for and from side to side.
呈现出上上下下、来来回回、左左右右3种性质的运动。