Obligative
专性的
🗣️ 情景例句
There are other boys and girls here,
还有其他男孩女孩在这儿，
Hello. Could I please speak to Miss Davis?
喂，麻烦你，请戴维斯小姐听电话。
If I place an order now, when would you be able to ship it?
如果现在下单子，什么时候可以出货？