N5#adjectives#conjugation#grammar#n5
い-Adjective Conjugation
Past, negative, and past-negative for い-adjectives.
Describing the past
Imagine you went to a restaurant last night. You want to tell your friend about the experience. You might say, 'The food was delicious, but the service wasn't good.'
In Japanese, adjectives change their form depending on whether you are talking about the present or the past, and whether the statement is positive or negative. Mastering these patterns allows you to express your opinions and experiences accurately.
The い-Adjective Formula
To conjugate an い-adjective, you modify the final 'い' (i).
Adjective-い＋Suffix
For the negative form, remove the final 'い' and add 'くない'. For the past form, remove the final 'い' and add 'かった'. For the past-negative, remove the final 'い' and add 'くなかった'.
Watch out
The adjective 'いい' (good) is an exception. When conjugating, it uses the stem 'よ' (yo). So, negative is 'よくない', and past is 'よかった'.
Examples in Action
See how these rules apply to common adjectives.
昨日は暑かったです。
Yesterday was hot.
昨日きのうyesterday暑かったあつかったwas hot
この映画は面白くないです。
This movie is not interesting.
このこのthis映画えいがmovie面白くないおもしろくないnot interesting
試験は難しくなかったです。
The exam was not difficult.
試験しけんexam難しくなかったむずかしくなかったwas not difficult
昨日のパーティーは楽し【かった】です。
Hint: Past tense of 楽しい
The party yesterday was fun.
Nuance and Politeness
These forms are standard for polite conversation.
When speaking politely, you add 'です' at the end of the conjugated adjective. In casual speech, you simply drop the 'です'.
Which sentence is more polite?
- 暑い。
- ✓ 暑いです。
Adding 'です' makes the sentence polite (desu/masu form).
Deep Dive: The 'i' stem
Understanding why we drop the 'i'.
In Japanese grammar, the 'い' at the end of these adjectives functions similarly to a verb ending. By removing it, you are creating a 'stem' that can accept different suffixes to change the tense or polarity of the word.
Lesson Summary
Recap of the conjugation rules.
To conjugate い-adjectives: Negative is -くない, Past is -かった, and Past-Negative is -くなかった. Remember to add 'です' for politeness.
暑い
あついadjective
hot (weather)面白い
おもしろいadjective
interesting/funny難しい
むずかしいadjective
difficult楽しい
たのしいadjective
fun