Learning objectives
- Conjugate all three verb groups accurately
- Distinguish the time and nuance of ta-form patterns
- Choose natural forms in speech and writing
1. Building the ta-form
Group 1 verbs change by final sound: ku→ita, gu→ida, u/tsu/ru→tta, nu/bu/mu→nda, and su→shita. Iku is the exception itta. Group 2 drops ru and adds ta; suru becomes shita and kuru becomes kita. I-adjectives use katta, while na-adjectives and nouns use datta.
2. More than a past tense
The ta-form marks past or completed events and anchors several high-frequency patterns: ta koto ga aru for experience, tari...tari suru for representative actions, tara for conditions, ta hou ga ii for advice, and ta bakari for a subjectively recent event.
3. Time and nuance
Ta tokoro emphasizes that an action has objectively just finished. Ta bakari reflects the speaker's sense that it was recent, even when more time has passed. With tara, the first event normally becomes true before the result follows.
Practical examples
1. 昨日、友だちと映画を見た。
I watched a movie with a friend yesterday.
2. 日本へ行ったことがあります。
I have been to Japan.
3. 週末は本を読んだり、音楽を聞いたりします。
On weekends I do things like read and listen to music.
4. 道に迷ったら、駅員に聞いてください。
If you get lost, ask a station employee.
5. この会社に入ったばかりです。
I have only recently joined this company.
Common pitfalls
Do not conjugate iku as iita
Although iku ends in ku, its ta-form is the fixed exception itta.
Tari does not mean two actions happen simultaneously
Tari...tari suru lists representative activities; use nagara for simultaneous actions.
Practice and answers
1. Change kaku into the ta-form.
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kaita / 書いた2. Say “I have eaten sushi” in Japanese.
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寿司を食べたことがあります。3. Complete: 雨が（ ）、出かけません。