kaisya ha kono sisetu wo tukaimasu.

When は is used as the topic particle, it is pronounced wa, not ha.

So in:

会社 は この 施設 を 使います。
the は marks 会社 as the topic of the sentence.

This is a special pronunciation rule for the particle は.
When は is part of a word, it is usually read ha, but as a particle, it is read wa.

は marks the topic of the sentence.

Here, 会社は means something like:

• As for the company, ...
• The company ...

So the sentence is presenting the company as the thing being talked about, and then says what it does: it uses this facility.

English does not have a direct equivalent to topic marking, so this can feel unfamiliar at first.

を marks the direct object of the verb.

In this sentence:

• 会社 = the company
• この 施設 = this facility
• 使います = uses / will use

So この 施設 を shows that this facility is the thing being used.

A natural way to think of it is:

• X を 使います = use X

この is a demonstrative determiner, meaning this. It must come directly before a noun.

So:

• この 施設 = this facility

You cannot use この by itself as a noun. It needs a noun after it.

Compare:

• この 施設 = this facility
• これ = this one / this

So if you want to say this facility, you use この + noun.

Both relate to this, but they are used differently:

• この
  • noun
    
    • この 施設 = this facility
• これ by itself
  
  • これは ... = this is ...

So in this sentence, この is correct because it directly modifies 施設.

You would not say これ 施設.

Japanese basic sentence order is often:

• topic / subject + object + verb

So:

• 会社 は = as for the company
• この 施設 を = this facility
• 使います = uses

Japanese verbs usually come at the end of the clause. This is one of the biggest word-order differences from English.

English: The company uses this facility.
Japanese: The company this facility uses.

That literal English order sounds strange, but it matches Japanese structure more closely.

使います is the polite non-past form of the verb 使う.

Base dictionary form:

• 使う = to use

Polite form:

• 使います

The non-past form in Japanese can mean:

• present habitual: uses
• future: will use

So depending on context, 使います could mean:

• uses
• will use

without changing the form.

Japanese does not have articles like the and a/an.

So 会社, 施設, and similar nouns do not automatically show whether they mean:

• a company / the company
• a facility / the facility

That information usually comes from context.

In this sentence, この makes 施設 specific:

• この 施設 = this facility

But 会社 could be understood as the company, a company, or simply the company we’re talking about, depending on context.

Sometimes yes, but the nuance changes.

• 会社はこの施設を使います。
  = As for the company, it uses this facility.
  This sounds like you are talking about the company as a topic.

• 会社がこの施設を使います。
  = The company uses this facility. / It is the company that uses this facility.
  This can sound more like identifying the subject, emphasizing the company, or answering a question such as Who uses this facility?

So は is more topic-oriented, while が is more subject-focused or contrastive depending on context.

Yes. 使います is a non-past form, and Japanese often relies on context to show whether something is present or future.

So this sentence could mean:

• The company uses this facility.
• The company will use this facility.

If there is a time expression, the meaning becomes clearer:

• 会社は明日この施設を使います。
  = The company will use this facility tomorrow.

Without context, English may need to choose one translation, but Japanese often leaves that open.

In this sentence, 会社 is marked with は, so it is definitely the topic. In many simple sentences like this, the topic is also understood as the logical subject.

So for practical beginner purposes, you can think of 会社 as:

• the topic
• and also the thing doing the action

But grammatically, は marks topic, not subject in the same way English does. That is why Japanese explanations often distinguish topic from subject.

Yes. Japanese often omits information that is clear from context.

For example, if everyone already knows the topic is the company, someone might just say:

• この施設を使います。
  = (It / they / the company) uses this facility.

Or if the facility is already clear:

• 会社は使います。
  This would need context to sound natural, but omission is common in Japanese.

So full sentences are often used for clarity, but everyday Japanese frequently leaves out words that English normally keeps.