Polite Ending

【GRAMMAR】

💡1: What is “DESU”? 
→DESU is a polite ending in Japanese.
It is used at the end of the sentence to make it sound polite, natural and complete.

DESU does not add much meaning by itself. Its main role is to show politeness and finish the sentence.

If you think about English,

If someone asks you a question, you can answer:

• “Yes.” → correct, but neutral

• “Yes, please.” → more polite

The word “please” doesn’t change the meaning of yes.
It just makes the answer sound polite and nicer.

DESU works in a similar way in Japanese.

It doesn’t change what you are saying, but it changes how polite your sentence sounds.

How Japanese Sentences work? (simple idea)
→Many simple Japanese sentences have two parts:

1:Topic – what you want to talk about
2: Description – what you want to say about it

Example1:“I am Japanese”

In this sentence:

→You want to talk about yourself ( I ) → Topic

→You want to say what you are ( Japanese )→ Description

• Watashi = topic (me)

• WA = marks the topic

• Nihonjin = description

• DESU = polite ending

→ Watashi WA Nihonjin DESU

Example2:”Sushi is delicious”

• Topic: Sushi

• Description: Oishii (delicious)

→ Sushi WA Oishii DESU

⏰ When to use?
　→Use DESU when you want to describe or give information about the topic politely.

It’s perfect for sentences like:

• Talking about what something is

• Describing how / what something is (beautiful, delicious, etc.)

However, you cannot use DESU with actions or locations — because those need verbs instead.

❌ Wrong: 

• I am in Tokyo (In Japanese it sounds more like I am EXISTING in Tokyo)
  ❌Watashi WA Tokyo DESU
  →Tokyo is not a description of “I”

• I eat Sushi
  ❌ Watashi WA Sushi DESU
  →Sushi is not a description of “I”

💡 Tip:
Think of DESU as the polite ending for “is / am / are” type sentences, but when there’s an action (eat, go, live, be in a place), you’ll use a verb instead, not DESU.