Desu means " is/ was" in A is B. You can put a noun or noun or
a noun phrase or an adjective. And this is more than that meaning of the
sentence literally; this sentense represents the verb sentence.
Ex.
Maishuu watashi wa goruhu o shimasu. Tsuma wa tenisu desu.(tenisu o shimasu)
Every week I play golf. My wife is (Play) tennis.
Noun conjugation
Present aff.
- desu
neg.
-dewa arimasen.
Past
-deshita.
-dewa arimasen deshita.
Conjugation Practice
I am a student. gakusei desu.
I am not a student. gakusei dewa arimasen.
I was a student. gakusei deshita.
I was not a student. gakusei dewa arimasen deshita.
na -Adjective conjugation
present tense aff.
- desu.
neg.
-dewa arimasen
past tense
aff.
-deshita
neg.
-dewa arimasen deshita
Conjugation Practice
I am fine. [watashi wa] genki desu.
I am not fine. [watashi wa] gakusei dewa arimasen.
I was fine. [watashi wa] genki deshita.
I was not fine. [watashi wa]genki dewa arimasen deshita.
i -Adjective conjugation
present tense aff.
-i desu.
neg.
-ku naidesu
past tense
aff.
-katta desu
neg.
-kunakatta desu
Conjugation Practice
I am sleepy. [watashi wa] nemu-i desu.
I am not sleepy. [watashi wa] nemu-kunaidesu.
I was sleepy. [watashi wa] nemu-katta desu.
I was not sleepy. [watashi wa] nemu-kunakatta desu.
l Sentence structure
Noun 1 wa Noun 2 desu.
Noun 1 wa Adjective desu.
I am John.
Watashi wa John desu.
This flower is beautiful. Kono hana wa kireidesu.
l wa follows noun 1 is the topic marker. But Topic is often omitted when it is obvious from the context. This sentence structure is not affected by person or numbers.
ex. I am a lawyer. [Watashi wa] bengoshi desu.
Ms. Brown and I are lowyers. Buraun- san to watashi wa bengoshi desu.
l desu am/ is/ are preceded noun 2 identify people or things.
l Add desu after your name when introducing yourself,
l The possessive particle no means ownership like “‘s” in English. Japanese people always mention their company name adding it before their name with “no” when introducing theirselves, mentioning their group which they belong to is important especially in business situation. When you want to mention your company, you can just add company .
ex. I am John Smith from Tokyo Bank.
Watashi wa Tokyo Bank no John Smith desu.
This is Mr. Yoshida from Toyota
Kochira wa Toyota no Yoshida-san desu.
Question
Noun 1 wa Noun 2 desu ka.
Hai,Noun 2 desu.
Iie,Noun 2 dewa arimasen.
ex. Is your phone number is 03-4567-1289?
Denwa bangoo wa 03-4567-1289 desu ka.
What is your hobby?
Go-shumi wa nan desu ka?
Is your phone number is 03-4567-1289?
Denwa bangoo wa 03-4567-1289 desu ka.
Yes, it is 03-4567-1289.
Hai, 03-4567-1289 desu.
No, it is not 03-4567-1289.
Iie, 03-4567-1289 dewa arimasen.