douzo enryosinaide, kono isu ni suwatte kudasai.

どうぞ makes the invitation sound warm, polite, and encouraging. In this kind of sentence, it is often like saying please, go ahead, or by all means in English.

So:

• どうぞ = please / go ahead
• 座ってください = please sit

Using both together is very natural in Japanese. どうぞ adds a welcoming tone, not just politeness.

遠慮する often means to hold back, to hesitate out of politeness, or to refrain.

So 遠慮しないで literally means don’t hold back or don’t hesitate.

In this sentence, it tells the listener:

• Please don’t be shy
• Please don’t stand on ceremony
• Don’t hesitate

It is very common when offering food, drinks, help, or a seat.

Both forms come from the negative of 遠慮する:

• dictionary form: 遠慮する
• negative: 遠慮しない

Then:

• 遠慮しないで = don’t hesitate
• 遠慮しなくて can connect to another clause, but it does not work as naturally here for this kind of request

The ～ないで form is commonly used to mean without doing X or don’t do X. In this sentence, 遠慮しないで is the natural choice for telling someone not to hold back.

The comma shows a pause between two parts:

1. どうぞ、遠慮しないで = Please, don’t hesitate
2. この椅子に座ってください = Please sit in this chair

So the sentence is really doing two things:

• encouraging the person
• then making the request

Japanese punctuation is sometimes flexible, but the comma here helps the rhythm and makes the sentence easier to follow.

The verb 座る normally takes に for the place where someone sits.

So:

• 椅子に座る = sit on/in a chair
• 床に座る = sit on the floor
• ベンチに座る = sit on a bench

Even though English often uses on, Japanese uses に with 座る to mark the location/destination of sitting.

Because 座る does not usually take を for the thing you sit on.

With 座る, Japanese normally uses:

• に for the place: 椅子に座る

So:

• この椅子に座ってください = natural
• この椅子を座ってください = incorrect

This is one of those cases where English and Japanese use different grammar patterns.

It comes from the verb 座る:

1. 座る = to sit
2. 座って = te-form
3. 座ってください = please sit

The pattern te-form + ください is a very common polite way to ask someone to do something.

Examples:

• 待ってください = please wait
• 見てください = please look
• 入ってください = please come in

So 座ってください is a polite request, not a command in a harsh sense.

Yes, it is polite and natural.

Why it sounds polite:

• どうぞ adds a courteous, welcoming tone
• 遠慮しないで sounds considerate
• 座ってください uses the polite request form ～てください

Overall, it sounds like something a host, teacher, coworker, or store employee might say.

It is polite, but not extremely formal. In very formal situations, a speaker might use more elevated expressions.

Yes, 座ってください by itself already means please sit.

But どうぞ adds extra warmth and invitation. Compare:

• 座ってください = Please sit.
• どうぞ、座ってください = Please, go ahead and sit.
• どうぞ遠慮しないで、座ってください = Please, don’t hesitate—go ahead and sit.

So どうぞ is not required, but it makes the speaker sound more welcoming.

この means this and must be followed by a noun.

So:

• この椅子 = this chair

Compare:

• この = this + noun
• これ = this thing

So you can say:

• この椅子に座ってください = Please sit in this chair.
• But not このに座ってください

Because この cannot stand alone.

In Japanese, 椅子に座る is the normal expression regardless of whether English would say sit on a chair or sometimes sit in a chair.

The important point is that Japanese uses に with 座る, and you should learn the whole pattern:

• 椅子に座る
• ソファーに座る
• 席に座る

It is better not to translate the particle too literally every time.

Japanese often leaves out the subject when it is obvious from context.

Here, the listener is clearly the person being addressed, so Japanese does not need to say あなたは.

If you added it, it would often sound unnecessary:

• この椅子に座ってください = natural
• あなたはこの椅子に座ってください = can sound overly explicit, and sometimes unnatural depending on context

Omitting the subject is very normal in Japanese.

No. Standard Japanese is normally written without spaces between words.

So this would usually be written as:

どうぞ、遠慮しないで、この椅子に座ってください。

Spaces are sometimes added in beginner materials to help learners see the word boundaries, but native Japanese writing usually does not use them this way.

Yes. A casual version might be:

• 遠慮しないで、この椅子に座って。
• どうぞ座って。

These are less formal because they remove ください.

So the original sentence is a polite version that would fit many everyday situations, especially when speaking to someone you do not know well or when you want to sound courteous.

No. Here it is friendly and encouraging, not critical.

In this sentence, 遠慮しないで means:

• please don’t be shy
• please make yourself comfortable
• please don’t feel you need to hold back

It is often used kindly when offering something. The speaker is trying to make the other person feel comfortable, not scolding them.