मोहल्ला शांत है; किरायेदार और पड़ोसी अच्छे हैं।

Because मोहल्ला is singular, so Hindi uses है.

• मोहल्ला शांत है = The neighborhood is quiet.

But किरायेदार और पड़ोसी refers to more than one person/group, so Hindi uses plural हैं.

• किरायेदार और पड़ोसी अच्छे हैं = The tenants and neighbors are nice/good.

So:

• singular subject → है
• plural subject → हैं

अच्छे agrees with किरायेदार और पड़ोसी, which is a plural human subject. In Hindi, when the group is plural and not specifically all feminine, the default agreement is masculine plural, so अच्छे is used.

Compare:

• वह अच्छा है = He/it is good.
• वह अच्छी है = She is good.
• वे अच्छे हैं = They are good.

Here, किरायेदार और पड़ोसी is a plural group, so अच्छे हैं is the natural form.

Because शांत is an adjective that usually does not change for gender or number in this kind of use. Many Hindi adjectives are variable like अच्छा / अच्छी / अच्छे, but others are invariable and stay the same.

So you can say:

• मोहल्ला शांत है
• गली शांत है
• लोग शांत हैं

In all of these, शांत stays शांत.

मोहल्ला means neighborhood, local area, or residential locality. It often feels a bit more local and community-based than a very broad word like area.

So मोहल्ला शांत है suggests that the local neighborhood or residential surroundings are quiet.

Here they are understood as plural because of the meaning and because the verb is plural: हैं.

Many Hindi nouns do not visibly change in the direct plural, especially nouns like these. So the same form can sometimes be singular or plural depending on context.

For example:

• किरायेदार अच्छा है = The tenant is nice.
• किरायेदार अच्छे हैं = The tenants are nice.

And similarly:

• पड़ोसी अच्छा है = The neighbor is nice.
• पड़ोसी अच्छे हैं = The neighbors are nice.

In your sentence, और plus अच्छे हैं makes it clear that plural people are being talked about.

Hindi does not normally use articles the way English does. So words like the, a, and an are often simply not translated.

That means:

• मोहल्ला can mean the neighborhood or a neighborhood
• किरायेदार can mean the tenant(s) or tenant(s)
• पड़ोसी can mean the neighbor(s) or neighbor(s)

Context tells you which meaning is intended. In this sentence, English would most naturally use the:

• The neighborhood is quiet; the tenants and neighbors are nice.

Yes, the order is very natural Hindi word order.

Hindi usually puts the subject first, then the description, and the form of to be at the end:

• मोहल्ला
  • शांत
    • है
• किरायेदार और पड़ोसी
  • अच्छे
    • हैं

So Hindi often looks like:

• Subject + adjective/complement + है/हैं

This is different from English only in where the verb appears. English says is/are earlier; Hindi usually saves it for the end.

It can mean either, depending on context. In a sentence like this, nice, pleasant, or good to deal with is usually the most natural meaning.

So किरायेदार और पड़ोसी अच्छे हैं usually suggests:

• the tenants and neighbors are nice people
• they are decent
• they are good to live around

It does not necessarily mean morally perfect; it often just means they are pleasant or satisfactory.

Yes, it is possible, especially in formal writing. The semicolon links two closely related statements:

• मोहल्ला शांत है
• किरायेदार और पड़ोसी अच्छे हैं

The idea is that both clauses describe the living situation.

In everyday writing, people might also write:

• मोहल्ला शांत है। किरायेदार और पड़ोसी अच्छे हैं।
• मोहल्ला शांत है, और किरायेदार और पड़ोसी अच्छे हैं।

So the semicolon is not a special grammar point; it is mostly a punctuation choice.

A rough guide:

• मोहल्ला = mohallaa
• पड़ोसी = paṛosī

A few pronunciation notes:

• In मोहल्ला, the ह is softly pronounced, and ल्ल is a doubled l sound.
• In पड़ोसी, the ड़ is a retroflex flap. It is somewhat like the quick tt/dd sound in American English butter, but with the tongue curled back a bit more.
• The final ी in पड़ोसी is a long ee sound.

If you want a very rough English-style approximation:

• मोहल्ला ≈ mo-HUL-laa
• पड़ोसी ≈ puh-RO-see

But the transliteration mohallā and paṛosī is more accurate.

Yes. शांत can mean quiet, calm, or peaceful, depending on context.

So:

• मोहल्ला शांत है can be:
  • The neighborhood is quiet.
  • The neighborhood is calm.
  • The neighborhood is peaceful.

If the context is about noise, quiet is best. If the context is about atmosphere or feeling, calm or peaceful may sound better.