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The polite Japanese verb system has four core endings: ます (non-past positive), ません (non-past negative), ました (past positive), and ませんでした (past negative). Connect each form to both time and positive-or-negative meaning.
The non-past covers habits, current general facts, and future plans. A time expression often tells you whether English uses present or future.
Manga scene · Read from right to leftRead from top to bottom
Koto's four-square calendar
Leo describes yesterday with the first form he learned.
Leo昨日、勉強します。
Yesterday, I study/will study.
Haru hears a past time word paired with a non-past ending and checks what Leo meant.
Haru昨日？
Yesterday?
A non-diegetic four-square guide beside Koto maps past/non-past against positive/negative.
Koto visual guideます｜ません｜ました｜ませんでした
Four polite forms
Leo uses the complete four-cell set and aligns the time word with the past-positive ending.
Leo昨日、勉強しました。
I studied yesterday.
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The four polite forms
Start with one dictionary verb and its ます stem, then learn the four endings as a set. These verbs slot into the predicate position of Japanese sentence structure.
| Japanese | Romaji | Meaning | Use |
|---|---|---|---|
行きます | ikimasu | go / will go | Non-past positive |
行きません | ikimasen | do not go / will not go | Non-past negative |
行きました | ikimashita | went | Past positive |
行きませんでした | ikimasen deshita | did not go | Past negative |
These are polite finite verb forms; do not add です after them. The full ending ませんでした works together as the past negative. Keep it as one rhythm instead of trying to construct it word by word during speech.
Use masu for habits and future plans
ます is non-past, not simply “present tense.” Time words and context decide whether it describes a habit or a future event.
| Japanese | Romaji | Meaning | Use |
|---|---|---|---|
毎朝コーヒーを飲みます | maiasa kōhī o nomimasu | I drink coffee every morning | Habit |
明日、東京に行きます | ashita, Tōkyō ni ikimasu | I will go to Tokyo tomorrow | Future plan |
日本語を勉強します | Nihongo o benkyō shimasu | I study/will study Japanese | Habit or plan from context |
七時に起きます | shichiji ni okimasu | I get up/will get up at seven | Schedule |
Japanese does not require a separate “will” word for an ordinary future plan. Avoid translating English auxiliary verbs one by one; state the future time and use ます.
Use masen for non-past negative
ません negates a habit, current policy, or future plan. The time expression again controls the natural English reading.
| Japanese | Romaji | Meaning | Use |
|---|---|---|---|
肉は食べません | niku wa tabemasen | I do not eat meat | Habit or choice |
明日は行きません | ashita wa ikimasen | I will not go tomorrow | Future negative |
お酒を飲みません | osake o nomimasen | I do not drink alcohol | General negative |
今日は勉強しません | kyō wa benkyō shimasen | I will not study today | Today's plan |
In invitations, 一緒に行きませんか literally uses a negative question but naturally means “Would you like to go together?” Learn that invitation as its own interaction pattern rather than interpreting it as a refusal.
Use mashita for completed past
ました marks a completed past action. Pair it with 昨日, 先週, or a past clock time.
| Japanese | Romaji | Meaning | Use |
|---|---|---|---|
昨日、勉強しました | kinō, benkyō shimashita | I studied yesterday | Completed activity |
朝ご飯を食べました | asagohan o tabemashita | I ate breakfast | Completed meal |
八時に着きました | hachiji ni tsukimashita | I arrived at eight | Past event time |
映画を見ました | eiga o mimashita | I watched a movie | Completed viewing |
If the action is ongoing now, ました is not the right form merely because it started earlier. Ongoing states and actions use other patterns such as ています, which belong in a separate lesson.
Use masen deshita for past negative
ませんでした says that an action did not happen in the past.
| Japanese | Romaji | Meaning | Use |
|---|---|---|---|
昨日は行きませんでした | kinō wa ikimasen deshita | I did not go yesterday | Past non-event |
朝ご飯を食べませんでした | asagohan o tabemasen deshita | I did not eat breakfast | Skipped action |
先週は勉強しませんでした | senshū wa benkyō shimasen deshita | I did not study last week | Past period |
そのメールを見ませんでした | sono mēru o mimasen deshita | I did not see that email | Past negative experience |
Keep the time and ending consistent. 昨日、行きません can be heard as incomplete or as a correction in a special context; the normal report of a finished yesterday uses 行きませんでした.
Move one verb through four polite forms
- ます and ません are non-past; time words distinguish habit and future.
- ました and ませんでした report completed past events.
- Learn positive/negative and past/non-past as a four-square system.
- Do not add です after these polite verb endings.
- Ongoing actions use another pattern; do not force every English tense into the four forms.
Use the full roadmap to choose the next situation or grammar lesson after this starter sequence.
Street Check · 1–3 minutes
Try the real-world task
Report one present, negative, past, and past-negative action.
Ready means:
- I can use ます for a present or future routine.
- I can use ません for a polite negative.
- I can choose the correct past affirmative or negative ending.
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