Although “masuk” and “masukin” look similar, the meanings and grammar functions are different.
Understanding the pattern helps learners use both correctly in daily conversation.

1. MASUK (verb: intransitive)

“Masuk” means to enter, to go in, or to come in.
It is an intransitive verb, meaning it does not take a direct object.

You use masuk when something goes inside by itself or someone enters a place.

Examples

• Aku mau masuk ke rumah.
  I want to enter the house.
• Air masuk ke dalam botol.
  Water entered the bottle.
• Dia sudah masuk kelas.
  He has entered the classroom.

2. MASUKIN (verb: informal, transitive)

“Masukin” (informal) means to put something into something.
This is a transitive verb, meaning it must have an object.

It comes from the base verb masuk + the informal suffix -in, which makes it causative:
➡️ to make something enter → to put something in

The formal version is “memasukkan.”

Examples

• Tolong masukin baju ke lemari.
  Please put the clothes into the closet.
• Dia masukin buku ke tasnya.
  He put the book into his bag.
• Masukin gula ke kopinya.
  Put sugar in his coffee.

3. Easy Summary

Word	Meaning	Part of Speech	When to Use
masuk	to enter / go in	intransitive verb	when no object follows
masukin	to put (something) into	transitive verb (informal)	when you must specify an object
memasukkan	formal version of “masukin”	transitive verb (formal)	in writing or formal speech

4. Example Sentence Pairs

1. Aku mau masuk kamar.
   I want to enter the room.Aku mau masukin barang ke kamar.
   I want to put things into the room.
2. Dia masuk ke mobil.
   He got into the car.Dia masukin koper ke mobil.
   He put the suitcase into the car.
3. Kucing itu masuk rumah.
   The cat entered the house.Aku masukin kucing itu ke kamar mandi.
   I put the cat into the bathroom.

5. Formula to Remember

• If something goes in by itself, use masuk.
• If you make something go in, use masukin.

Practice: Masuk vs Masukin

Instructions:
Fill in the blanks with the correct word: masuk (to enter) or masukin (to put something into).
Hint:

• Use masuk when there is no object after the verb.
• Use masukin when the sentence requires an object (something being put inside something).

1. Tolong _______ sepatu ke dalam rak.
2. Aku mau _______ ke kamar dulu.
3. Bisa kamu _______ pakaian ini ke lemari?
4. Dia sudah _______ ke kantor pagi ini.
5. Jangan lupa _______ botol kosong ke kotak daur ulang.
6. Anaknya takut buat _______ ke kolam renang.
7. Mereka lagi _______ barang-barang ke mobil.
8. Aku lihat angin _______ lewat jendela yang terbuka.
9. Bisa tolong _______ kucingnya ke kandang?
10. Temanku belum _______ ke grup WhatsApp.