ドアを閉める

The structure is very straightforward. First, you have the noun ドア (doa). This is a loanword from English. Next comes the particle を (o). This marks the door as the object. Finally, you use the verb 閉める (shimeru). In its dictionary form, it is 閉める. For daily conversation, you might say 閉めます (shimemasu). If you are asking a friend, say 閉めて (shimete). It is like building with Lego blocks.

Use this when you enter a room. Use it when you leave your house. It is essential when getting into a taxi. In Japan, taxi doors are often automatic. But you still use this verb to describe the action. Use it when the air conditioning is on. Or use it when you want some privacy. It is perfect for any physical barrier with hinges. It also works for sliding doors in modern apartments.

Be careful with other types of closing. Do not use it for your eyes. For eyes, the verb is 閉じる (tojiru). Do not use it for a book or a laptop. Those also use 閉じる. If a shop is closing for good, use 店をたたむ. If a shop is just closing for the night, use 店を閉める. But you don't need the word ドア there. Also, don't use it for closing a deal. That requires a different set of vocabulary entirely.

Japanese culture places high value on consideration for others. This extends to how you handle doors. Slamming a door is seen as very aggressive. It suggests you are angry or poorly raised. Traditional Japanese houses use 引き戸 (hikido) or sliding doors. These require a gentle touch to close quietly. There is even a specific sound for a sliding door. It is a soft shuru-shuru sound. Closing a door softly shows you are a polite person. It respects the peace of the household.

You will hear ドアが閉まります (doa ga shimarimasu) on trains. This means the doors are closing. Note the change from を to が. This is because the train doors close automatically. Another common one is 閉め切る (shimekiru). This means to close something up tightly. You might use this during a storm. If you want to be very polite, use お閉めください. You will hear this in high-end hotels or shops.