"You must go home and rest for a bit."

Translation: 你一定要回家休息一下。

[brandonrte]

Why is 要 necessary here?

[dafadllyn]

Because 一定 just means "definitely" and thus it intensifies 要 "to need, to must".

[phoque]

Yes, because 要 is being used here to form 'a command' (You must) - see https://www.chineseboost.com/grammar/five-uses-yao/

[GeoffreyHanson]

Shouldn't just 一定 or 要 also be accepted?

[Aleksandro_RU]

The same question

[NathanRasm]

2020-06-18 just 要 is accepted. But I think 你一定回家 is more like "you definitely go home" than "you ought to go home."

[MaynardHogg]

Hanping Lite lists both 一定 and 要 as "must" singly and together. Go figure!

[cSwede]

Same here

[Feather.55]

I have same question as brandonrte

[Eoin790683]

Still not fixed - 1 year on and it still insists on 要.

[LaBiciEsMia]

Why not "你一定要回家和休息一下" ?

[NathanRasm]

和 joins nouns together, but not verbs. You can, however, use the Chinese comma (，) to join the verbs.

[niche21stGmail]

Why 必须 is incorrect?

[RonaldChan14]

”你一定要回家去，休息一下“ wasn't accepted.

[mendosi]

When you say 回家 (or for any other place, like 回辦公室) you don't normally need either a 去 or a 來.

[MaynardHogg]

Must be your comma.