san-shuu-kan-mae-vssan-shuu-mae

If you have ever tried to say “3 weeks ago” in Japanese, you may have wondered whether to say 3週間前 (san-shuu-kan-mae) or 3週前 (san-shuu-mae). And what about years — is it 3年前 (san-nen-mae) or 3年間前 (san-nen-kan-mae)? The rules here are specific and important: only certain time words use 〜間 (kan), and some combinations are simply wrong. This guide clarifies exactly which forms are correct and which ones sound unnatural to native speakers.

Yuka

Hey Rei, what’s the best way to remember the difference between 〜間前 and 〜前?

Rei

The best trick is to associate each word with a strong image or situation. By the end of this article you’ll have one for each — promise!

At a Glance: 〜間前 vs. 〜前

The Key Rule: When Does 〜間 (kan) Attach?

In Japanese, 〜間 (kan) is added to certain time words to express a duration — how long a period lasted. Not all time words require it. Here is the rule:

• 週 (shuu — week) always takes 〜間: 1週間、2週間、3週間. You cannot say 3週 alone when counting weeks.
• 年 (nen — year) does NOT take 〜間 in the 〜前 construction. Say 3年前, not 3年間前. (Note: 3年間 is valid when it means “for 3 years,” but 3年間前 as “3 years ago” is wrong.)
• 日 (nichi/ka — day) does NOT add 〜間 in this context. Say 3日前.
• ヶ月 (kagetsu — month) does NOT add 〜間 in this context. Say 3ヶ月前.

The simplest takeaway: weeks always need 〜間; years, months, and days do not use 〜間前.

Yuka

That makes sense! So 〜間前 is about… okay, I think I’m starting to get it.

Rei

You’re getting it! And the more you practice using 〜間前 in sentences, the more automatic it becomes. Language learning is all about repetition.

3週間前 — 3 Weeks Ago (Correct Form)

3週間前 is the only correct way to say “3 weeks ago.” The 〜間 is mandatory when using 週 to count time. Without it, the sentence sounds incomplete or strange to native speakers.

Formation note: Number + 週間 + 前. The 〜間 is part of the time word, not optional. 1週間前 (isshuukan mae — 1 week ago), 2週間前 (nishuu kan mae — 2 weeks ago), etc.

Example 1 — talking about when something happened:

3週間前に引っ越しました。
San-shuu-kan-mae ni hikkoshimashita.
I moved 3 weeks ago.

Example 2 — recalling a past event:

2週間前から体調が悪い。
Ni-shuu-kan-mae kara taichou ga warui.
I have been feeling unwell since 2 weeks ago.

Example 3 — planning reference:

その映画は1週間前に公開された。
Sono eiga wa isshuukan mae ni koukai sareta.
That movie was released 1 week ago.

Yuka

Alright. And now explain 〜前? I want to make sure I have both down.

Rei

Sure! 〜前 is actually the easier one to remember once you have a clear mental image. Let’s look at the examples.

3年前 — 3 Years Ago (Correct Form)

When using 年 (year) with 前 to mean “ago,” do NOT add 〜間. The correct form is simply Number + 年 + 前. Adding 間 here creates 年間前, which is not a standard Japanese expression and will sound wrong to native speakers.

Important distinction: 3年間 (sannenkaan) by itself is correct and means “for a period of 3 years” (duration). But combining it with 前 to make 3年間前 as a way to say “3 years ago” is wrong. If you want to say “3 years ago,” just say 3年前.

Example 1 — 3 years ago:

3年前に日本に来ました。
San-nen-mae ni Nihon ni kimashita.
I came to Japan 3 years ago.

Example 2 — comparing past and present:

5年前と比べると、この町はずいぶん変わった。
Go-nen-mae to kuraberu to, kono machi wa zuibun kawatta.
Compared to 5 years ago, this town has changed a lot.

Example 3 — telling a story:

10年前、私は学生だった。
Juu-nen-mae, watashi wa gakusei datta.
10 years ago, I was a student.

Full Chart: Time Words + 前 (ago)

Decision Flowchart

You want to say "___ ago" in Japanese:
                    |
                    v
         What time unit are you using?
                    |
       +------------+-------------+------------+
       |            |             |            |
      DAY          WEEK         MONTH        YEAR
       |            |             |            |
       v            v             v            v
    〇日前       〇週間前        〇ヶ月前       〇年前
  (mikka-mae)  (san-shuu-       (san-         (san-
               kan-mae)        kagetsu-mae)  nen-mae)
               ※ ALWAYS add
               〜間 with weeks

Quick Quiz — Test Yourself!

Yuka

Okay Rei, quiz time! I want to test how well I’ve absorbed all this.

Rei

Challenge accepted on your behalf! Let’s see how much of 〜間前 and 〜前 has sunk in.

Choose the correct form for each blank.

Q1. I started studying Japanese 2 weeks ago.
2＿＿＿前から日本語を勉強し始めた。
Ni-___ mae kara Nihongo wo benkyou shi-hajimeta.

Answer: 週間 (shuu-kan) → 2週間前
Reason: Weeks always need 〜間: 週間前.

Q2. I visited Kyoto 3 years ago.
3＿＿＿前に京都を訪れた。
San-___ mae ni Kyouto wo otozureta.

Answer: 年 (nen) → 3年前
Reason: Years do NOT add 〜間 before 前: 3年前 (not 3年間前).

Q3. She called me 5 days ago.
彼女は5＿＿＿前に電話してきた。
Kanojo wa itsuka-___ mae ni denwa shite kita.

Answer: 日 (nichi) → 5日前
Reason: Days do not use 〜間前: just 5日前.

Q4. That project started 6 months ago.
そのプロジェクトは6＿＿＿前に始まった。
Sono purojekuto wa roku-___ mae ni hajimatta.

Answer: ヶ月 (kagetsu) → 6ヶ月前
Reason: Months do not use 〜間前: 6ヶ月前.

Q5. I met him for the first time 4 weeks ago.
4＿＿＿前に初めて彼に会った。
Yon-___ mae ni hajimete kare ni atta.

Answer: 週間 (shuu-kan) → 4週間前
Reason: Weeks must use 〜間: 週間前 (not 週前).

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