May dalawang sobre.

Here, may is an existential marker. It means something like there is or there are in English.

So:

• May dalawang sobre. = There are two envelopes.

In other contexts, may can also help express possession, depending on the sentence structure, but in this example it simply introduces the existence of something.

Dalawa means two, but when a number directly modifies a noun, it usually takes a linker.

Because dalawa ends in a vowel, the linker appears as -ng:

• dalawa
  • -ng
    • sobre → dalawang sobre

This is a very common pattern in Filipino:

• isang libro = one book
• tatlong bata = three children
• apat na kotse = four cars

So dalawang sobre means two envelopes.

In Filipino, nouns usually do not change form for singular vs. plural the way English nouns do.

So:

• sobre can mean envelope or envelopes
• the number tells you how many there are

Because dalawang already shows that the noun is plural, sobre stays the same.

Because dalawang already makes the noun plural.

In Filipino, when a noun is preceded by a number, you normally do not use mga:

• dalawang sobre = correct
• dalawang mga sobre = generally not standard

Use mga when you want to mark a noun as plural without a specific number:

• mga sobre = envelopes

But with a number, the number itself is enough.

The structure is:

• may
  • number phrase
    • noun

So:

• may = there is/there are
• dalawang sobre = two envelopes

This is a very common Filipino pattern for saying that something exists.

You can think of it as:

• May X. = There is/There are X.

Examples:

• May tao. = There is a person / There are people.
• May tatlong upuan. = There are three chairs.

Yes, those are also used.

• May dalawang sobre. = very common and straightforward
• Mayroong dalawang sobre. = also correct, a bit fuller
• Merong dalawang sobre. = common in casual speech

For a beginner, may + noun phrase is the safest and simplest pattern:

• May dalawang sobre.

That is the form you should be most comfortable with first.

No.

They are spelled the same in English writing, but they are completely different words.

In May dalawang sobre:

• may is a Filipino grammar word meaning there is/there are

It is not the English month name.

A simple guide is:

• May → like English my
• dalawang → da-la-wang
• sobre → so-bre

A rough full pronunciation is:

• my da-la-wang so-bre

Stress usually falls like this:

• da-la-WANG
• SO-bre

So the whole sentence sounds roughly like:

• may da-la-WANG SO-bre

Sobre is a noun meaning envelope.

It is a borrowed word, originally from Spanish, which is very common in Filipino vocabulary. Many everyday Filipino words come from Spanish, especially for household items, time, numbers in some contexts, and common objects.

Even though it is borrowed, it behaves like a normal Filipino noun in the sentence:

• May dalawang sobre.

Not by itself in the usual reading.

May dalawang sobre most naturally means:

• There are two envelopes

If you want to say that a specific person has two envelopes, Filipino normally makes that clearer, for example:

• May dalawang sobre siya. = He/She has two envelopes.
• May dalawang sobre ako. = I have two envelopes.

So without a pronoun or other context, the sentence is usually understood as an existential statement: there are two envelopes.

Because this is a simple existential sentence, and that structure does not need ang or ay.

• ang is often used to mark the focused/topic noun in many sentence types
• ay is used in a more formal or inverted topic-comment structure

But with may, the sentence is already complete:

• May dalawang sobre.

That is the normal, natural way to say it.