你一定要这样粗鲁吗？

Must you be quite so crude?

《柯林斯英汉双解大词典》

事情并不一定要这样的。

It does not have to be this way.

youdao

其实并不一定要这样做！

It doesn't have to be this way!

youdao

- If someone-- you're-- one of you're predecessor didn't already submit it, do follow the directions at top left which says, add calendar so that we can augment the data set even further.

如果-,除非前任代表没有提交相应信息，一定要遵循左上方的用法说明，添加日历,这样就可以进一步增大数据集。

哈佛公开课 - 计算机科学课程节选

It's a really disgusting habit and you have to stop doing this. It's so impolite.

这真是个令人作呕的习惯。你一定要改掉。这样太没礼貌了。

have to 实战 - SpeakingMax英语口语达人

All right, turn them off. If they have to make noise as you turn them off, turn them off, but that's it. So, when you walk through that door, it's an act of free will.

好了，把它们关掉，如果一定要发出声音,当关机的时候，也要关机，就这样，当你走进那扇门，这是自由意志的选择。

麻省理工公开课 - 固态化学导论课程节选