मेहमान यहाँ हैं।

• मेहमान = guest / guests
• यहाँ = here
• हैं = are / is (polite or plural form of to be)

So the structure is basically:

• मेहमान = subject
• यहाँ = place
• हैं = verb

Hindi often puts the location before the verb, so literally it is something like Guests here are.

हैं is used for:

• plural subjects
• respectful/polite singular subjects

So if मेहमान means guests, then हैं is correct.

Compare:

• मेहमान यहाँ है। = The guest is here.
• मेहमान यहाँ हैं। = The guests are here.

But there is an important extra point: Hindi also uses हैं for one person when speaking respectfully. So मेहमान यहाँ हैं। can also sometimes mean The guest is here, if that guest is being referred to politely.

By itself, मेहमान can look the same in singular and plural. In this sentence, the verb helps:

• है suggests singular
• हैं suggests plural or respectful singular

So in isolation:

• मेहमान यहाँ है। = probably The guest is here.
• मेहमान यहाँ हैं। = probably The guests are here.

Context decides the final meaning.

Not all Hindi nouns form the plural in the same way. Many masculine nouns ending in -आ change visibly, for example:

• लड़का → लड़के

But मेहमान is one of many nouns whose direct singular and direct plural are the same:

• singular: मेहमान
• plural: मेहमान

So Hindi often shows the number through the verb or context rather than by changing the noun itself.

Hindi usually follows Subject–Object–Verb order, and the verb often comes at the end of the sentence.

So:

• English: The guests are here.
• Hindi: मेहमान यहाँ हैं।
  literally: Guests here are.

This is normal Hindi word order. The important thing is that हैं usually comes at or near the end.

Yes. यहाँ मेहमान हैं is also grammatical.

The difference is mainly in emphasis:

• मेहमान यहाँ हैं। = focuses first on the guests
• यहाँ मेहमान हैं। = may sound more like There are guests here / Guests are here

Hindi allows some flexibility in word order, especially when the meaning is still clear from context.

Hindi does not have articles exactly like English a/an/the.

So मेहमान can mean:

• a guest
• the guest
• guests
• the guests

The exact meaning comes from context.

That is why मेहमान यहाँ हैं। can be translated naturally as The guests are here, even though there is no separate word for the.

यहाँ is pronounced roughly like yahaan.

A few helpful points:

• य = y
• हाँ has a long vowel sound, like haa
• the little dot/chandrabindu shows nasalization, so the end is slightly nasal: -hā̃

So a rough learner-friendly pronunciation is:

• yah-HAÃ

Do not pronounce it like two fully separate English words; it flows as one word.

हैं is roughly pronounced hain, but the vowel is nasalized.

A simple learner approximation is:

• haĩ

It is not exactly like English hen or hane. The nasalization matters, especially in careful speech.

Also note:

• है = hai
• हैं = haĩ (nasalized)

In fast everyday speech, the difference can sound subtle, so listening practice helps.

It is completely natural and normal. It works in everyday speech and writing.

You might use it in situations like:

• telling someone that the guests have arrived
• answering Who is here?
• informing someone politely that the guest(s) are present

So this is a very useful basic sentence pattern.

Yes, depending on what kind of here you mean.

For example:

• यहाँ = here (general, standard)
• यहीं = right here / exactly here (more emphasis)

So:

• मेहमान यहाँ हैं। = The guests are here.
• मेहमान यहीं हैं। = The guests are right here.

The version with यहाँ is the neutral, standard one.

The usual basic form is:

• मेहमान यहाँ है।

That uses singular है.

But remember: if you are speaking respectfully about one guest, Hindi may still use हैं:

• मेहमान यहाँ हैं। = The guest is here (respectful)
• मेहमान यहाँ हैं। = The guests are here (plural)

So Hindi learners have to pay attention to both number and respect/politeness.