yaksok siganeul memojange jeogeo duseyo.

약속 시간 means the time of an appointment, meeting time, or the time you promised to meet.

• 약속 = promise, appointment, arrangement
• 시간 = time

Together, 약속 시간 refers to the scheduled time for a meeting or appointment.

The -을 is the object particle.

In this sentence, the thing being written down is 약속 시간, so it takes the object marker:

• 약속 시간을 적다 = to write down the appointment time

So 시간을 shows that the appointment time is the direct object of 적다.

메모장에 means in/on a memo pad, in a notebook, or sometimes in a notes app, depending on context.

• 메모장 = memo pad, notepad, notes app
• -에 = a particle often used for location or destination

Here, -에 marks the place where the writing goes:

• 메모장에 적다 = to write it in/on a memo pad

So the idea is: write the appointment time in the memo pad.

The basic verb is 적다, which means to write down or to jot down.

In the sentence, it appears as 적어 두세요, which is built from:

• 적다 → 적어
• 두다 → 두세요

So this is not just a simple write command. It has the added meaning of writing something down and leaving it there for later use.

적어 두세요 means something like:

• Please write it down and keep it noted
• Please make a note of it
• Please write it down for later

This uses the pattern -아/어 두다, which often means:

• do something now
• so that it is ready, available, or preserved for later

So:

• 적으세요 = Please write it.
• 적어 두세요 = Please write it down and keep it written for future reference.

This pattern is very common in Korean.

For example:

• 문을 열어 두세요 = Please leave the door open.
• 미리 준비해 두세요 = Please prepare it in advance.

Because this is the grammar pattern -아/어 두다, not a simple sequence of two separate actions.

• 적어 두다 is a set expression meaning to write down and leave it that way
• 적고 두다 would sound unnatural here

So 적어 두세요 is the natural form.

Formation:

• 적다 → stem 적-
• add -어 → 적어
• then 두세요

Here, 두세요 comes from 두다, which literally means to put or to leave.

But in grammar patterns like -아/어 두다, it often adds the meaning of:

• leaving something in a certain state
• doing something in advance
• doing something for future convenience

So in 적어 두세요, 두세요 does not literally mean put. It helps create the meaning:

• please write it down and leave it noted

Also, -세요 makes it a polite request or instruction.

Yes, it is polite.

The ending -세요 is a common polite way to tell someone to do something:

• 적어 두세요 = Please write it down.

It is polite and natural in everyday conversation, instructions, customer service, classrooms, and workplace situations.

It is less formal than very official written styles, but perfectly standard and respectful.

The subject is understood to be you, but Korean often leaves subjects out when they are obvious from context.

So:

• 약속 시간을 메모장에 적어 두세요
• literally: Appointment time, in the memo pad, write down and keep
• natural English: Please write down the appointment time in your memo pad.

In commands and requests, Korean usually does not say you unless it needs emphasis.

Yes. 메모장 can refer to:

• a physical memo pad or notebook
• a digital notes app
• a notepad-type space for writing notes

The exact meaning depends on context.

So this sentence could mean:

• write it in your notebook
• jot it down in your memo pad
• put it in your notes app

You will often see both, but 적어 두세요 is the standard spacing taught in grammar-based learning because 두다 is functioning as an auxiliary verb.

So:

• 적어 두세요 = standard separated form
• 적어두세요 = also commonly seen in real life

For learners, using 적어 두세요 is a safe choice.

Yes, absolutely. That is a very natural English translation.

Because 적어 두세요 carries the idea of writing something down for later reference, translations like these all work well:

• Please write down the appointment time.
• Please make a note of the appointment time.
• Please note down the appointment time.

The exact English wording can vary, but the Korean meaning stays the same.

The sentence sounds like practical advice or a polite instruction.

The speaker is not just telling someone to write something as a random action. The nuance is more like:

• this is important
• you may need it later
• it would be smart to note it down now

So the full feeling is:

• Please make a note of the appointment time so you have it later.