هي شافت المقاس وعايزة تغير البنطلون.

In Egyptian Arabic, the verb often already shows who the subject is. So شافت by itself already means she saw.

That means هي is not strictly necessary here. It can be added for:

• clarity
• emphasis
• contrast
• or simply because it sounds natural in conversation

So both of these are possible:

• هي شافت المقاس وعايزة تغير البنطلون
• شافت المقاس وعايزة تغير البنطلون

The version with هي feels a bit more explicit: She saw the size and wants to change the pants.

Because the subject is feminine singular: هي = she.

In Egyptian Arabic:

• شاف = he saw
• شافت = she saw

The -ت at the end marks the feminine singular in the past tense.

So:

• هو شاف = he saw
• هي شافت = she saw

عايزة means wanting or more naturally wants in this sentence. It comes from a word that behaves a lot like an adjective/active participle, but in everyday Egyptian Arabic it is very commonly used to express want.

Forms:

• عايز = masculine singular
• عايزة = feminine singular
• عايزين = plural

So because the subject is she, we use عايزة.

Examples:

• أنا عايز قهوة = I want coffee. (said by a man)
• أنا عايزة قهوة = I want coffee. (said by a woman)
• هي عايزة تغير البنطلون = She wants to change the pants.

Because this sentence is in Egyptian Arabic, not Modern Standard Arabic.

In MSA, you might say something like:

• هي تريد أن تغيّر البنطال

But in Egyptian Arabic, speakers normally use:

• هي عايزة تغير البنطلون

This is one of the most common colloquial ways to say want.

تغير here means change or exchange.

After عايز / عايزة, Egyptian Arabic usually follows with another verb in the present tense form:

• عايز أروح = I want to go
• عايزين ناكل = we want to eat
• عايزة تغير البنطلون = she wants to change the pants

Here, تغير is the form used with she:

• أنا أغير = I change
• إنتَ/إنتِ تغيّر/تغيري = you change
• هي تغير = she changes

So after عايزة, the meaning is wants to change.

It can mean either, depending on context.

In a shopping context, تغير البنطلون often means:

• exchange the pants
• switch the pants for another one
• change to a different pair/size

So in this sentence, it likely means she saw the size and now wants to exchange the pants.

Arabic often uses a more general verb where English might choose a more specific one based on context.

المقاس means the size.

Using الـ makes it definite. In context, this usually refers to a specific size being checked:

• the size on the item
• the size she was given
• the relevant size in the situation

Without الـ, مقاس would sound more like a size or size in a more general sense.

So:

• شافت المقاس = she saw/checked the size
• شافت مقاس would be less natural here unless the context specifically called for a size

البنطلون means the pants.

The definite article الـ is used because we are talking about a specific item, not just pants in general. It is probably the pair she is holding, trying on, or discussing with the store.

Compare:

• عايزة تغير البنطلون = she wants to change the pants
• عايزة تغير بنطلون = she wants to change a pair of pants / pants (less specific)

In natural conversation, the definite form is very common when the object is already known from context.

Yes, و literally means and, but in natural speech it can connect ideas in a way that English might render as:

• and
• so
• and now
• then

So شافت المقاس وعايزة تغير البنطلون can feel like:

• She saw the size and wants to change the pants.
• She saw the size, so she wants to change the pants.

The exact nuance depends on context.

A common pronunciation would be roughly:

hiyya shāfet el-meʔās wi-ʿāyza tughayyar el-banṭalōn

A few notes:

• هي = hiyya
• شافت = shāfet
• المقاس is often pronounced el-meʔās
• و is often pronounced wi before a consonant
• عايزة = ʿāyza
• تغير here is often heard as tughayyar or tighayyar, depending on speaker and speed
• البنطلون = el-banṭalōn

Pronunciation varies a bit by speaker, so small differences are normal.

That is a normal feature of Egyptian Arabic pronunciation.

In Modern Standard Arabic, the definite article is usually described as al-. In Egyptian Arabic, it is commonly pronounced more like el-.

So:

• المقاس → el-meʔās
• البنطلون → el-banṭalōn

This is one of the first pronunciation differences learners notice between MSA and Egyptian Arabic.

The given order is very natural:

• هي شافت المقاس وعايزة تغير البنطلون

But Arabic word order is somewhat flexible. For example, you could also hear:

• شافت المقاس وهي عايزة تغير البنطلون
• هي عايزة تغير البنطلون بعد ما شافت المقاس

The original sentence is straightforward and conversational. It gives:

1. what happened first: she saw the size
2. what she wants now: she wants to change the pants

So the word order helps the sentence flow naturally.

Its basic meaning is size, but in real-life shopping contexts it can overlap with ideas like:

• size
• measurement
• how the item corresponds to the wearer

Still, مقاس usually refers most directly to the size itself, such as:

• small / medium / large
• a number size
• whether it is the correct size

If you want to talk more specifically about fit, speakers might use other wording depending on the situation.

Because Egyptian Arabic usually does not need a separate word equivalent to English to before an infinitive.

English says:

• she wants to change

Egyptian Arabic says:

• هي عايزة تغير

Literally it is more like:

• she wanting changes

But the actual meaning is simply:

• she wants to change

This is a very common pattern:

• عايز أنام = I want to sleep
• عايزة أتكلم = I want to speak
• عايزين نشتري حاجة = we want to buy something

So English uses to + verb, while Egyptian Arabic usually just uses عايز / عايزة + present-tense verb.