英文字Then

通常這THEN是回應提及的建議

意思大約是「"那麼就"去做吧」

這跟THEN本身(普遍)的字義"那時/然後"沒有太大關係。

你找找字典其中一個用法的解釋就是"那麼"。

then, adv, suggested usage:-
(1)refer to a particular time in the future
(2)You've been asked&read the email, so I'll see you work then.
(3)please do it then.
(4)Read and do it there and then.
(5)Attention:- used to show the logical result of the particular email written.
(6)Formally, used to introduce a summary of something that has just been read:-These are the main jobs concerned, then, please do it then !
(7)just want you agree his discision by then. Your Attention then ,please.

then (adverb)
【口】那麼好吧〔用在句末﹐尤表示贊同或引人注 意〕 ~Yahoo dictionary

呢個時間用既 "then" , 即係"果時"

please do it then, 即係果時去做.

呢的文句, 都會有限定條件, 比如會先講, 當某人黎到, 就去做 - when Mr A arrive, please do it then

又或者係一的常規既動作, 比如, 每日 10 點就去做, every 10:00 am, please do it then