يا ريت العريس والعروسة يكونوا مبسوطين.

A common pronunciation is:

ya reit il-ʿarīs wil-ʿarūsa yikūnu mabsūṭīn

A few helpful notes:

• الـ is usually pronounced il- in Egyptian.
• و + الـ often comes out as wil- in natural speech, so والعروسة sounds like wil-ʿarūsa.
• يكونوا is often pronounced yikūnu.
• مبسوطين sounds like mabsūṭīn.

يا ريت is a very common expression for a wish.

Depending on context, it can mean:

• I hope
• I wish
• If only
• May ...

In this sentence, it expresses a nice wish for the couple, so I hope / may the bride and groom be happy is the right feel.

In this phrase, يا ريت works as a fixed expression, so it is best to learn it as one chunk.

Even though يا is often the vocative particle used in calling someone, in يا ريت you should not try to translate it word by word. Just remember:

يا ريت = I hope / I wish

Because the sentence is talking about a specific, identifiable pair: the groom and the bride.

In Arabic, when two definite nouns are joined by و meaning and, each noun normally keeps its own definite article:

• العريس والعروسة = the groom and the bride

So this is completely normal Arabic structure.

That is a normal Egyptian pronunciation pattern.

When و meaning and comes before a word that starts with الـ, Egyptian Arabic usually smooths it out in speech:

• و + العروسة → wil-ʿarūsa or sometimes wel-ʿarūsa

So this is not a different word or different grammar. It is just how connected speech sounds in Egyptian.

Because in Egyptian Arabic, two people joined by و are normally treated as a plural group for verb agreement.

So:

• العريس والعروسة = the groom and the bride
• يكونوا = they be / may they be

A learner coming from Standard Arabic may expect a dual form like يكونا, but everyday Egyptian usually uses the plural here, not a special dual verb form.

Yes, Arabic often leaves out to be in simple present sentences.

For example, in plain statements, Arabic can say the equivalent of:

• they happy

But after يا ريت, using يكونوا is very natural because it expresses a wished-for state:

• يا ريت ... يكونوا مبسوطين = I hope / may ... be happy

So here يكونوا helps build the idea of being in the wish.

Because Arabic normally uses the masculine plural for mixed groups.

Since the group is:

• one man + one woman

the adjective takes masculine plural agreement:

• مبسوطين = happy for a mixed group

If the group were all female, you would normally use the feminine plural instead.

In Egyptian Arabic:

• العريس = the groom
• العروسة = the bride

This pair is extremely common in wedding contexts.

One thing that can confuse learners is that عروسة can also mean doll in other contexts, but here it clearly means bride.

Yes. مبسوط and مبسوطين are very common in Egyptian Arabic for happy, pleased, or glad.

It sounds natural and conversational. A more formal Arabic learner might know words like سعيد or سعداء, but in everyday Egyptian, مبسوط is one of the most common choices.