انا بفضل القميص الابيض، وهي بتفضل البنطلون الاسود.

They are the same verb, but they match different subjects.

• أنا بفضل = I prefer
• هي بتفضل = she prefers

In Egyptian Arabic, the present tense changes by person and sometimes gender. Here:

• بفضل goes with أنا
• بتفضل goes with هي

A useful extra point: بتفضل by itself can also mean you prefer depending on context, so saying هي makes it clearly mean she.

In Egyptian Arabic, بـ is very commonly used with the present tense for regular actions, habits, and general statements.

So:

• بفضل = I prefer
• بتفضل = she prefers

This is one of the big differences between Egyptian Arabic and Modern Standard Arabic. In MSA, you would expect forms like أفضّل or تفضّل, but in Egyptian everyday speech, the بـ is normal.

You can often leave them out if the meaning is already clear.

For example, you could say:

• بفضل القميص الأبيض
• وبتفضل البنطلون الأسود

However, pronouns are often kept for clarity or emphasis. In this sentence, أنا and هي help show a contrast:

• I prefer the white shirt,
• and she prefers the black pants.

Also, as mentioned above, بتفضل can be ambiguous by itself, so هي helps.

Because that is the normal word order in Arabic: noun first, adjective second.

So:

• القميص الأبيض = the shirt + the white
• البنطلون الأسود = the pants + the black

This is the usual pattern in both Egyptian Arabic and Modern Standard Arabic.

Because Arabic adjectives agree with the nouns they describe in definiteness.

If the noun is definite, the adjective must also be definite:

• القميص الأبيض = the white shirt
• البنطلون الأسود = the black pants

If the noun were indefinite, the adjective would also be indefinite:

• قميص أبيض = a white shirt
• بنطلون أسود = black pants / a black pair of pants

So Arabic does not do the shirt white with only one the. If the noun has ال, the adjective usually does too.

Because they are agreeing with masculine singular nouns.

Both قميص and بنطلون are treated as masculine singular nouns, so the adjectives are also masculine singular:

• أبيض = white, masculine
• أسود = black, masculine

If the noun were feminine, the adjective would change too. In Egyptian Arabic, you will often hear feminine forms like:

• بيضا = white, feminine
• سودا = black, feminine

For example:

• العربية البيضا = the white car
• الشنطة السودة = the black bag

It is written together, but it is really two parts:

• و = and
• هي = she

Arabic often attaches short words like و directly to the next word in writing. So وهي simply means and she.

Because Arabic treats this as a singular noun.

• بنطلون means pants / trousers
• Grammatically, it behaves like a singular noun

So Arabic says something closer to the trouser item where English uses a plural-looking word pants.

This is very normal, and you should just learn بنطلون as a singular vocabulary item.

A rough pronunciation is:

ana bafaddal il-ʔamīṣ il-abyaḍ, w hiyya bitfaddal il-banṭalōn il-iswid

A few notes:

• ال is often pronounced il- or el- in Egyptian speech.
• ق in قميص is often pronounced like a glottal stop in Cairo, so learners may hear something like ʔamīṣ instead of qamīṣ.
• أسود is often pronounced more like iswid in Egyptian everyday speech, even though the spelling stays Arabic-standard-looking.

You may hear small pronunciation differences depending on the speaker.

Yes, but the meaning changes a little.

• بفضل = I prefer
• بحب = I like / I love

So:

• أنا بفضل القميص الأبيض means the white shirt is your preference compared with another option.
• أنا بحب القميص الأبيض means you like the white shirt, but it does not necessarily compare it to anything else.

In this sentence, بفضل is the better choice because the sentence contrasts two preferences.