"우리들이 대답해야 돼요."

Translation: We have to reply.

[ItsSejong]

Can someone explain this one?

[josueetcom]

우리들이 - we

대답하다 - to answer; to reply; to respond

-야 되다/하다 - have to; need to; should (literally "to be becoming only if" since -야 approximates to "only if/when". Note that "to be becoming" is sort of like "to be ok")

-야 attaches to the -아/-어/-여 form of the verb (대답해 in this case)

All together you get "It is ok (돼요) only if (-야) we (우리들이) reply (대답해)", which essentially translates to and means "We have to reply."

[ElCion96]

We have to answer is also acceptable

[oee16]

V + 아/어/여 + 야 되다 - ought to
(Obligation to a lesser degree of importance)/should

V + 아/어/여 + 야 하다 - must
(Duty, obligation)/have to

Although,

"Have to" usually implies the obligation is imposed upon by another party

"Should" - suggestion, advice.

[lsb_18]

"reply" here can be translated to "답장" as well

[oee16]

우리들 = 우리 = we

답장하다 > 답장해
= to reply > reply

~야 돼다 > ~야 돼요
= to have to~ > have to (?)
[*ought to, preferred]

[Allen740376]

대답해주래?