ما برای شام دو بشقاب دیگر لازم داریم.

Yes. In Farsi, subject pronouns are often omitted because the verb ending already shows the person.

• داریم = we have / we need in this structure
• So برای شام دو بشقاب دیگر لازم داریم is also completely natural.

Adding ما gives extra emphasis or clarity, like we in English when you want to stress who needs them.

برای means for, and شام means dinner.

So برای شام = for dinner.

In this sentence, it tells you the purpose or occasion:

• ما برای شام دو بشقاب دیگر لازم داریم.
• We need two more plates for dinner.

After numbers in Farsi, the noun usually stays in the singular form.

So:

• دو بشقاب = two plates
• سه کتاب = three books
• پنج صندلی = five chairs

Using ها after a number is normally unnecessary and usually sounds wrong in a basic counting phrase.

Here, دیگر means another / more / additional.

So:

• دو بشقاب دیگر = two more plates / two additional plates

This is a very common pattern in Farsi:

• یک کتاب دیگر = one more book
• سه نفر دیگر = three more people

In Farsi, words like دیگر often come after the noun in this kind of expression.

So the normal order is:

• دو بشقاب دیگر = two more plates

Not:

• دو دیگر بشقاب

This is just the standard Farsi word order for this meaning.

Literally:

• لازم = necessary / needed
• داریم = we have

So لازم داریم literally feels like we have need for or we have as necessary, but in natural English it means we need.

This is a common way to express need in Persian:

• من پول لازم دارم = I need money
• ما زمان بیشتری لازم داریم = We need more time

Yes. You can also say:

• ما برای شام به دو بشقاب دیگر نیاز داریم.

This also means We need two more plates for dinner.

A useful difference:

• لازم داریم often takes the thing needed directly:
  دو بشقاب دیگر لازم داریم
• نیاز داریم often appears with به:
  به دو بشقاب دیگر نیاز داریم

Both are correct and natural.

Because دو بشقاب دیگر is not acting like a definite direct object here.

In this sentence, the phrase is simply the thing that is needed:

• دو بشقاب دیگر لازم داریم = we need two more plates

را is usually used for definite direct objects. Since this is an indefinite quantity (two more plates, not the two plates), را does not appear.

A rough breakdown is:

• ما = we
• برای شام = for dinner
• دو بشقاب دیگر = two more plates
• لازم داریم = need

So the order is roughly:

Subject + prepositional phrase + object/needed thing + verb

This fits the normal Farsi tendency for the verb to come at the end.

Yes, بشقاب is the normal word for a plate or dish in everyday Persian.

So:

• دو بشقاب دیگر naturally means two more plates

If the context is a dinner table, this is exactly the kind of word a speaker would use.

Yes, it is understandable and natural. A native speaker might also say slightly different versions, such as:

• برای شام دو بشقاب دیگه لازم داریم.
  More conversational, with spoken دیگه instead of دیگر
• برای شام به دو بشقاب دیگر نیاز داریم.
  Slightly more formal or neutral
• دو تا بشقاب دیگه برای شام لازم داریم.
  Very colloquial everyday speech

But the original sentence is perfectly good standard Persian.