Blocul este liniștit dimineața.

In this sentence, blocul means the apartment building (a block of flats), not a city block.

In Romanian:

• bloc = apartment block / apartment building
• blocul = the apartment building (with the definite article attached)

Romanian usually puts the definite article at the end of the noun, not in front as English does.

• bloc = a block / block
• blocul = the block (the apartment building)

So -ul is the masculine/neuter singular definite article, equivalent to English the in this context.

Both mean is (3rd person singular of a fi = to be).

• este – full form, neutral, used in writing and careful speech
• e – shorter, very common in everyday speech and also accepted in writing

You can say:

• Blocul este liniștit dimineața.
• Blocul e liniștit dimineața.

Both are correct; the meaning is the same.

No, not in standard Romanian.

You need the verb este/e here:

• ✅ Blocul este liniștit dimineața.
• ✅ Blocul e liniștit dimineața.
• ❌ Blocul liniștit dimineața. (incorrect as a normal sentence)

Adjectives in Romanian agree with the gender and number of the noun.

• bloc is a neuter noun, but:
  • in the singular, neuter behaves like masculine
  • in the plural, neuter behaves like feminine

So in the singular:

• blocul (neuter, acting as masculine) → liniștit (masculine/neuter singular form)

If it were plural:

• blocurile (neuter plural, acting as feminine) → liniștite
  Blocurile sunt liniștite dimineața. = The blocks are quiet in the morning.

liniștit can mean:

• quiet (not noisy) – as here
• calm, peaceful (for people, situations)

In this sentence, it’s most naturally understood as:

• The building is quiet in the morning.

You could also translate more loosely as:

• The building is peaceful in the morning.

• dimineață = (a) morning
• dimineața = the morning, but also used to mean in the morning / in the mornings / every morning in a general, habitual sense.

In this sentence, dimineața means something like:

• in the morning / in the mornings / in the morning in general

So:

• Blocul este liniștit dimineața.
  = The building is quiet in the morning (as a general, repeated situation).

By default, with dimineața in this form, it usually suggests a general / habitual situation:

• The building is (usually) quiet in the morning.

If you wanted to emphasize this morning only, you’d usually specify:

• Blocul este liniștit în dimineața asta.
  The building is quiet this morning.

Yes, you can change the word order; Romanian is quite flexible. All of these are possible:

• Blocul este liniștit dimineața. (neutral word order)
• Dimineața blocul este liniștit. (emphasis a bit more on dimineața / the time)
• Dimineața, blocul este liniștit. (same, with a comma if written)

The meaning stays essentially the same; the choice mainly affects emphasis and style.

In liniștit dimineața:

• ș (in liniștit) = like sh in she
  • liniștit ≈ lee-nish-TEET
• ț (in dimineața) = like ts in cats
  • dimineața ≈ dee-mee-NEE-a-tsa
• ă (not present here, but common in Romanian) = a short, neutral vowel, similar to the a in sofa when unstressed.

Yes, for example:

• Dimineața, în bloc este liniște.
  Literally: In the morning, in the building there is quiet(ness).

Here:

• este liniște = there is quiet / it is quiet (using the noun liniște = quietness, silence)

You need the plural of both the noun and the adjective:

• Blocurile sunt liniștite dimineața.

Breakdown:

• bloc → blocuri (blocks) → blocurile (the blocks / the apartment buildings)
• liniștit (singular) → liniștite (feminine/neuter plural)
• sunt = are (3rd person plural of a fi)