As I have show you how to convert Verbs into past tense in my previous post. Today, I will show you how to convert Adjectives into Past Tense.

 
English
Expensive
Heavy
Fast
Bad / Poor
Difficult
Enjoy / Fun
Delicious

Quiet
Beautiful / Pretty / Nice
Skillful
Like
Polite
Kind
Convenient

Good

 
Present Tense
Takai
Omoi
Hayai
Warui
Muzugashii
Omoshiroi
Oishii

Shizuka
Kirei
Jouzu
Suki
Teinei
Shinsetsu
Benri

Ii

 
Past Tense
Takakatta
Omokatta
Hayakatta
Warukatta
Muzugashikatta
Omoshirokatta
Oishikatta

Shizuka deshita
Kirei deshita
Jouzu deshita
Suki deshita
Teinei deshita
Shinsetsu deshita
Benri deshita

Yokatta

As you can see above, there are 3 types of usage for different group of adjectives. The top part which uses “katta” is simple. All you need to do is to remove the “i” at the back and replace with “katta”. However there are some words with an “i” at the back but you cannot replace it with “katta”. These are special words. Sound confusing, right? Yes, it indeed very confusing where many Japanese Learner got them mixed up.

Those words (adjectives) without an “i” at the end will definately use “deshita”. You don’t need to remove any alphabet (in Japanese – the hiragana character) whereby you just need to add a “deshita” at the back. To identify which adjective that end with “i” requires “katta” or “deshita”, simply look at the second japanese character.

For example : teinei (in hiragana, it identifies as te i ne i) – If the fourth character is just before the “i”, then use “deshita”. In this case, the “ne” is the fourth character just before the “i”. Just like “kirei (ki re i)” – “re” is the fourth character.

For more information on the Japanese Character, have a look at Pronunciation section

You must remember, the “i” that I mentioned above is Japanese Character not English Alphabet. Dont mix up with this otherwise you will end up saying “Suki” as “Sukkatta” which will make the Japanese scratching their heads.

Suki or Benri doesn’t end with “i” but instead there are end with “ki” and “ri” respectively.

OK, the last one which is “Ii” (Good). This is a very special word that will change totally to different word. For past tense, you have to use “yokatta”.