daidokoro no zyaguti ga sikkari simaranai node, kanrigaisya ni renrakusimasita

の links two nouns and often works like of or 's in English.

• 台所 = kitchen
• 蛇口 = faucet / tap
• 台所の蛇口 = the kitchen faucet

So here, の shows that the faucet belongs to or is located in the kitchen.

が marks 蛇口 as the thing experiencing the problem: the faucet is the thing that doesn't close properly.

With が, the sentence focuses on what is happening with the faucet itself.

• 蛇口が閉まらない = the faucet won't close

If you used は, it would sound more like setting up the faucet as the topic for contrast or discussion:

• 蛇口は閉まらない = as for the faucet, it won't close

That is possible in some contexts, but が is very natural when simply describing the issue.

In this sentence, しっかり means something like:

• firmly
• securely
• properly
• all the way

So しっかり閉まらない means the faucet does not shut completely or securely.

This is a very common adverb in Japanese and has a broad meaning depending on context. For example:

• しっかり勉強する = study properly / seriously
• しっかり持つ = hold firmly
• しっかり閉まる = close tightly

This is an important intransitive/transitive pair:

• 閉まる = to close, to be closed (intransitive)
• 閉める = to close something (transitive)

Here the faucet is being described as something that won't close, so Japanese uses the intransitive verb:

• 蛇口が閉まらない = the faucet won't close

If you said 蛇口を閉めない, that would mean someone does not close the faucet, which is a different idea.

Grammatically, 閉まらない is simply the negative form of 閉まる:

• 閉まる → 閉まらない

So literally it means doesn't close or won't close.

In context, it often implies a practical problem:

• it doesn't close properly
• it won't shut completely
• it can't be fully turned off

So while it is not the explicit potential form, English may naturally translate it as can't close properly depending on the situation.

ので means because, since, or so. It connects a reason to a result.

Structure:

• [reason] ので、 [result]

In this sentence:

• 蛇口がしっかり閉まらないので = because the faucet doesn't close properly
• 管理会社に連絡しました = I contacted the management company

Compared with から, ので often sounds a bit softer, more explanatory, and a little more polite/formal.

Both can mean because, but the nuance is a little different.

• ので: softer, more explanatory, often sounds more polite
• から: more direct, more assertive, common in everyday speech

So:

• 蛇口がしっかり閉まらないので、管理会社に連絡しました
• 蛇口がしっかり閉まらないから、管理会社に連絡しました

Both are understandable, but ので feels especially natural when explaining a situation calmly, such as reporting a maintenance issue.

This is normal Japanese grammar.

Before connectors like ので, verbs usually appear in their plain form:

• 閉まらないので

The sentence can still end politely:

• 連絡しました

So Japanese often mixes:

• plain form inside the sentence
• polite form at the end

That is not a mismatch. It is standard usage.

管理会社 means management company.

In housing contexts, it usually refers to the company that manages:

• an apartment building
• rental property
• condominium building

They handle things like:

• repairs
• tenant issues
• maintenance
• building rules

So if something in the apartment is broken, contacting the 管理会社 is very natural.

With 連絡する, the person or organization you contact is commonly marked with に.

• 管理会社に連絡しました = I contacted the management company

So here に marks the target of communication.

You may also sometimes see 連絡をする, where 連絡 is treated as a noun:

• 管理会社に連絡をしました

That means the same thing.

Yes. 連絡する is a suru-verb:

• 連絡 = contact / communication
• 連絡する = to contact

Past polite form:

• 連絡しました = contacted

This is one of many noun + する verbs in Japanese, such as:

• 勉強する = to study
• 電話する = to call
• 説明する = to explain

Japanese often omits subjects when they are clear from context.

In English, you need I contacted the management company.
In Japanese, if it is obvious who did the action, you can simply say:

• 管理会社に連絡しました

The speaker is understood from context.

This is very common in Japanese and one of the biggest differences from English.

Yes, often it could.

• 台所 = kitchen
• キッチン = kitchen

Both are used, but the nuance can vary a little:

• 台所 sounds like a native Japanese word and can feel slightly more traditional or practical
• キッチン is a loanword and is very common in modern everyday speech

So キッチンの蛇口 would also sound natural in many situations.