Learn Japanese Adjective Conjugation Rules Questions and Answers

Question 1

A student is describing a movie they watched yesterday. Which sentence correctly uses the past tense of the i-adjective 面白い (omoshiroi - interesting)?

Accepted Answer

昨日の映画は面白かったです。

Answer

To make an i-adjective past tense, the final い (i) is removed and replaced with かった (katta). To make it polite, です (desu) is added after the past tense form. Therefore, 面白い (omoshiroi) becomes 面白かった (omoshirokatta), and the polite form is 面白かったです (omoshirokatta desu).

Question 2

Which of the following is the correct plain negative form for the na-adjective 静か (shizuka - quiet)?

Accepted Answer

静かじゃない (shizuka janai)

Answer

Na-adjectives conjugate like nouns. To make them negative in the plain form, you add じゃない (ja nai) or ではない (dewa nai) after the adjective. The other options incorrectly apply i-adjective conjugation rules or use redundant politeness markers.

Question 3

A speaker wants to say, 'This room is spacious and bright.' How should they correctly connect the two i-adjectives 広い (hiroi - spacious) and 明るい (akarui - bright)?

Accepted Answer

この部屋は広くて、明るいです。

Answer

To connect two i-adjectives, you change the first adjective into its te-form. For i-adjectives, this is done by dropping the final い (i) and adding くて (kute). So, 広い (hiroi) becomes 広くて (hirokute). The tense of the entire sentence is determined by the final adjective.

Question 4

How do you correctly place the na-adjective 有名 (yūmei - famous) before the noun レストラン (resutoran - restaurant) to mean 'a famous restaurant'?

Accepted Answer

有名なレストラン (yūmei na resutoran)

Answer

When a na-adjective directly modifies a noun that follows it, the particle な (na) must be placed between the adjective and the noun. This is the defining characteristic from which 'na-adjectives' get their name.

Question 5

The weather yesterday was not good. Which of the following sentences correctly expresses this using the past negative form of いい (ii - good)?

Accepted Answer

昨日の天気はよくなかったです。

Answer

The adjective いい (ii) is irregular. For all conjugations other than the present affirmative, it uses its older form よい (yoi). To make the past negative, よい is first made negative (よくない - yokunai), and then this form is made past tense by changing the final い to かった, resulting in よくなった (yokunakatta). です is then added for politeness.

Learn Japanese Practice Test

Learn Japanese Practice Test

Learn Japanese Adjective Conjugation Rules Questions and Answers