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GRAMMAR
〜次第
as soon as
Explanation
NOTE

〜次第しだい means as soon as or the moment — it expresses that the next action will happen immediately once the preceding action is completed.

会議かいぎが終おわり次第しだい、ご連絡れんらくします。
As soon as the meeting ends, I'll contact you.
Used in **formal**, business-like contexts. The second clause is usually a future action you intend to take.
NOTE

The second clause cannot be in the past tense — 〜次第 looks forward to something not yet done, so volitional, request, or future expressions follow.

NOTE

Attach to the verb masu-stem (drop ます): 着つきます → 着つき次第. Do not confuse with 〜次第だ / 〜次第で, which mean depends on.

STRUCTURE
Vます
<ruby>次第<rt>しだい</rt></ruby>
商品しょうひんが届とどき次第しだい、お知しらせします。
Shouhin ga todoki shidai, oshirase shimasu.
As soon as the product arrives, I will let you know.
準備じゅんびができ次第しだい、出発しゅっぱつしましょう。
Junbi ga deki shidai, shuppatsu shimashou.
As soon as we're ready, let's depart.
東京とうきょうに着つき次第しだい、電話でんわします。
Toukyou ni tsuki shidai, denwa shimasu.
As soon as I arrive in Tokyo, I will call you.

Practice exercises

1
準備じゅんびでき次第しだい、出発しゅっぱつします。
As soon as we are ready, we will depart.
Answer
次第しだい
2
書類しょるいが届とどき次第しだい、手続てつづきを始はじめます。
As soon as the documents arrive, we will start the procedure.
Answer
次第しだい
3
結果けっかがわかり次第しだい、連絡れんらくします。
As soon as the result is known, I will contact you.
Answer
次第しだい
4
確認かくにんでき次第しだい、返信へんしんいたします。
As soon as I can confirm, I will reply.
Answer
次第しだい
5
承認しょうにんが下おり次第しだい、速すみやかに発注はっちゅういたします。
As soon as approval is granted, we will promptly place the order.
Answer
次第しだい