Grammar: verb groups, tense and polite or plain style
Read and practise non-past, negative, past and past-negative verb forms.
Section G2 · Grammar · Verb groups and inflections
Exam scope and assessment notes
This is an original mapped starter, not the recommended full course of about 130 guided learning hours. All Japanese examples, translations, grammar explanations, kanji groupings, listening scripts and pronunciation aids require review by a qualified Japanese-language teacher before publication is described as complete. Browser speech is supplemental, not Cambridge audio. Speaking rehearsal and writing feedback are formative and do not reproduce a live examiner or award official marks. The linked vocabulary workbook has not been reconciled word by word.
Before you begin
Work on paper. Try each question before revealing help, and explain why your method works.
Quick readiness check
Which approach gives the most reliable Japanese response?
What you will learn
- Recognise verb time and polarity in polite and plain styles.
- Use a consistent style in a short response.
Read the ending before choosing meaning
The syllabus gives 食べます / 食べません / 食べました / 食べませんでした and 食べる / 食べない / 食べた / 食べなかった as examples. Other verbs use different group-specific changes.
Identify polite or plain style, then check tense and negation. Do not apply 食べる's pattern to every verb.
Choose a suitable register
Polite forms fit many everyday exchanges with unfamiliar people. Plain forms are used in appropriate familiar contexts and before reported thoughts or speech.
This introduces the framework; a specialist must check verb groups and examples.
Sources for this lesson
Pause and explain
What does ませんでした add to a verb?
Worked example
Read 「日曜日に本を読みませんでした。」 What did the writer not do, and when?
Show the worked solution
- Find 読みませんでした.
- Identify its negative past form.
- Keep the day and object attached.
Answer The writer did not read the book on Sunday. It does not say whether they read it another day.
Try a topic test
Choose Easy, Normal or Difficult. Save your answers and open worked review after finishing.
Test this topic →From guided practice to a new situation
Write your answer and reasoning first. Use a hint only if you are stuck. The model solution is for self-checking; your written work is not automatically marked.
Compare 食べます and 食べました. What changes in time?
Give me a hint
Keep polite style constant and focus on the ending.
Compare my reasoning
- Identify both as polite.
- Compare the endings.
- State the time difference.
食べます is polite non-past; 食べました is polite past. The second places eating in the past.
Look for these in your work
- Identifies style
- Distinguishes time
- Explains change
A student says 「昨日、学校へ行きませんでした。」 What did not happen?
Give me a hint
Read the negative past ending as a unit.
Compare my reasoning
- Find 昨日.
- Identify 行きませんでした.
- State the action that did not occur.
The student did not go to school yesterday. The sentence gives no reason.
Look for these in your work
- Recognises past negation
- Reports action
- Avoids inventing a reason
A friend reports 「日本語を勉強したと思います。」 What does it report, and what should be checked?
Give me a hint
Notice the plain verb before と思います and preserve uncertainty.
Compare my reasoning
- Identify the action.
- Read と思います as a thought.
- Do not turn the thought into confirmed fact.
The speaker thinks they studied Japanese. It is a thought, not a verified fact; a Japanese teacher should confirm form and context.
Look for these in your work
- Finds action
- Recognises reported thought
- Preserves uncertainty
Common mistakes
- Using one verb group's rule for every verb
- Missing negation in a past form
- Changing register mid-response
What can you explain now?
What does ませんでした add to a verb?
Compare with the explanation
Polite style, past time and negation
It says the action did not happen in the past.
After trying it yourself, choose your next review. This is your self-assessment.
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Make it stick
Explain one idea from memory, answer the checkpoint, and name a Japanese form or reading that needs checking.
If you needed the solution, close it and solve the problem again from a blank page. A correct answer is stronger when you can explain the reason for each step.