Japanese Grammar

The Plain Form (Dictionary Form)

The Plain form (also known as Dictionary form) is used for casual conversations with friends and is the building block for many advanced grammar patterns.

Why do we need the Plain Form?

So far, you've learned the 'Masu-form' (e.g., tabemasu, nomimasu). This is polite and safe. But what if you are talking to a close friend or family member?

In casual situations, Japanese people drop the polite 'masu' and use the 'Plain form'. Because this is how verbs appear in a dictionary, it is often called the 'Dictionary form'.

Beyond casual speech, you MUST use the Plain form before adding other grammar words, like 'to think that...' (~to omoimasu) or 'because' (kara/node).

How to find the Dictionary Form

Group 1 (U-Verbs)
Masu-stem
โ†’Change to 'u' sound
Change the 'i' sound before masu to 'u'
ๆ›ธใใพใ™ (kaki-masu)
โ†’ๆ›ธใ (kaku)
To write
ๅพ…ใกใพใ™ (machi-masu)
โ†’ๅพ…ใค (matsu)
To wait
้ฃฒใฟใพใ™ (nomi-masu)
โ†’้ฃฒใ‚€ (nomu)
To drink
Group 2 (Ru-Verbs)
Masu-stem
โ†’Add ใ‚‹ (ru)
Drop masu, add ru
้ฃŸในใพใ™ (tabe-masu)
โ†’้ฃŸในใ‚‹ (taberu)
To eat
่ฆ‹ใพใ™ (mi-masu)
โ†’่ฆ‹ใ‚‹ (miru)
To see
Group 3 (Irregular)
ใ—ใพใ™ (shimasu)
โ†’ใ™ใ‚‹ (suru)
To do
ใใพใ™ (kimasu)
โ†’ใใ‚‹ (kuru)
To come
The 4 Plain Forms (Casual Speech)
Present (+)
โ†’้ฃŸในใ‚‹ (taberu)
I will eat (Plain form)
Present (-)
โ†’้ฃŸในใชใ„ (tabenai)
I will not eat (Nai-form)
Past (+)
โ†’้ฃŸในใŸ (tabeta)
I ate (Ta-form)
Past (-)
โ†’้ฃŸในใชใ‹ใฃใŸ (tabenakatta)
I didn't eat (Nakatta-form)

Casual vs Polite Sentences

Polite: ๆ˜Žๆ—ฅใ€ๅญฆๆ กใซ่กŒใใพใ™ใ€‚
Casual: ๆ˜Žๆ—ฅใ€ๅญฆๆ กใซ่กŒใใ€‚
I will go to school tomorrow. (Iku is the plain form of ikimasu)
Polite: ๆ˜จๆ—ฅใ€ๆ˜ ็”ปใ‚’่ฆ‹ใพใ—ใŸใ‹๏ผŸ
Casual: ๆ˜จๆ—ฅใ€ๆ˜ ็”ปใ‚’่ฆ‹ใŸ๏ผŸ
Did you watch a movie yesterday? (Notice the 'ka' is dropped in casual questions)
Polite: ็ด่ฑ†ใฏ้ฃŸในใพใ›ใ‚“ใ€‚
Casual: ็ด่ฑ†ใฏ้ฃŸในใชใ„ใ€‚
I don't eat natto.

Teacher's Advice

Casual Questions

When asking a question in casual speech, NEVER use the particle 'ใ‹ (ka)' at the end! Saying 'Iku ka?' sounds extremely rough and masculine, like you are a yakuza. Just say 'Iku?' with a rising intonation at the end.

JLPT Exam Patterns

  • โ€ขUsing Plain Form + ใจๆ€ใ„ใพใ™ (to omoimasu - I think that...) (N5/N4)
  • โ€ขUsing Plain Form + ๅ‰ใซ (mae ni - Before doing...) (N5)
  • โ€ขUsing Plain Form + ใคใ‚‚ใ‚Šใงใ™ (tsumori desu - I intend to...) (N4)

Practice the Plain Form

Drill the conversion between Masu-form and Plain form until you can switch instantly.

Start Practice โ†’