jungyohan yeonrakcheoneun memojie jeokgo jiugaedo yeope duseyo.

The particle 는 marks 연락처 as the topic: as for important contact information... This gives the sentence a slightly instructional or contrastive feeling, like talking about what should be done with important contact info.

If you said 연락처를, it would focus more directly on the object of write down. Both are possible in Korean, but 연락처는 sounds natural when giving advice or instructions about a topic.

The particle 에 here marks the place or surface where the writing goes. So 메모지에 적다 means to write it on memo paper.

In English, we say write on paper, and Korean uses 에 for that idea.

Yes, in this sentence 적다 means to write down / to note.

There is another word 적다 that means to be few / to be little, but that is a different word with the same spelling. Korean has several homonyms like this, so the meaning comes from context. Since the sentence talks about contact information and memo paper, the meaning is clearly write down.

-고 connects verbs and usually means and, and then, or after doing. Here, 적고 지우개도 옆에 두세요 links two actions:

• write down the important contact information
• and keep an eraser next to it too

So it gives a smooth sequence of instructions.

Yes. In Korean, when actions are connected with -고, the final verb often carries the sentence ending for the whole instruction. So even though only 두세요 has -세요, the sentence still works as two polite instructions:

• 적고 → write it down
• 두세요 → keep/place it

This is very common in Korean.

도 means also or too. So 지우개도 means an eraser too / also an eraser.

It implies that, in addition to writing the contact information down, you should also keep an eraser nearby. The 도 adds the sense of don’t forget this extra thing as well.

Literally, 옆에 means at the side / next to, and 두세요 comes from 두다, which means to put, to place, or to leave. So 옆에 두세요 means put it next to you, place it beside it, or keep it nearby.

In this sentence, it most naturally means keep the eraser nearby / next to the memo paper.

Korean often uses 두다 for the idea of putting something somewhere and leaving it there ready for use. So 옆에 두세요 sounds very natural for keep it by your side or leave it next to you.

It is more physical and location-based than simply saying have.

-세요 is a polite ending used for requests, instructions, and gentle commands. It is common in everyday speech, signs, classroom instructions, and manuals.

So 두세요 means something like:

• please put it there
• please keep it nearby
• do keep it beside you

It sounds polite, not harsh.

Yes. Korean often omits the subject when it is obvious from context. In a sentence ending with -세요, the understood subject is usually you. So the full sense is:

You, write down important contact information on memo paper, and keep an eraser nearby too.

But Korean normally leaves you unstated.

Yes, 지우개 means eraser. The sentence may assume you are writing with a pencil, or it may simply be giving practical advice to keep correction tools nearby while noting important information.

Even if it feels a little unusual in English, grammatically it is completely straightforward Korean. The main point is: write the important contact information down and keep an eraser beside you too.