لو المطر لسه نازل، مش هقدر اتمشى في الشارع.

لو means if.

In this sentence, it introduces a condition:

• لو المطر لسه نازل = if the rain is still falling

In Egyptian Arabic, لو is the normal everyday word for if in many conditional sentences.

Arabic often keeps the noun explicit where English might use it.

So instead of saying something like if it’s still raining, Egyptian Arabic commonly says:

• لو المطر لسه نازل
• literally: if the rain is still coming down

This sounds natural in Egyptian Arabic.

لسه means still or sometimes yet, depending on context.

Here it means still:

• لسه نازل = still falling / still coming down

Examples:

• لسه صاحي = he’s still awake
• لسه ماجاش = he hasn’t come yet

So in your sentence, لسه shows that the rain started earlier and continues now.

نازل literally means coming down or descending.

For rain, this is a very natural Egyptian way to say that it is falling:

• المطر نازل = it’s raining / the rain is falling

So:

• المطر لسه نازل = the rain is still coming down

This is more idiomatic in Egyptian than translating English word-for-word.

In Egyptian Arabic, an active participle like نازل is often used to describe an ongoing state or situation.

So both of these can work:

• المطر نازل = the rain is falling / it’s raining
• المطر بينزل = the rain is falling

But نازل often sounds very natural for something currently in progress or visibly happening.

In this sentence, لسه نازل gives a smooth, conversational meaning:
still coming down.

This has three parts:

• مش = negation marker, not
• هـ or هَ = future marker, will
• أقدر = I can / I’m able

So:

• هقدر = I’ll be able
• مش هقدر = I won’t be able

In the sentence:

• مش هقدر أتمشى = I won’t be able to walk / go for a walk

Because the meaning is about the future result of the condition.

• أقدر = I can
• هقدر = I will be able to

Since the sentence means something like If the rain is still falling, I won’t be able..., the future marker هـ fits naturally.

أتمشى means to walk around, to stroll, or to go for a walk.

It is not just the basic idea of moving on foot from one place to another. It often suggests a casual walk.

So:

• مش هقدر أتمشى = I won’t be able to go for a walk

If the intended meaning is specifically walk around outside, أتمشى is a good everyday choice.

Because قدر means to be able, and it is usually followed by another verb that tells you what someone is able to do.

So:

• هقدر أتمشى = I’ll be able to walk
• مش هقدر أخرج = I won’t be able to go out
• هقدر أروح = I’ll be able to go

This works much like English can / be able to + verb.

Arabic uses prepositions differently from English.

• في usually means in
• but in many contexts, it corresponds to natural English in, on, or at

So:

• في الشارع literally = in the street
• natural English = in the street or sometimes on the street, depending on context

Here it simply means being out walking in the street/public road area.

A natural pronunciation would be something like:

law il-maṭar lissa nāzil, mish haqdar atmashsha fil-shāriʿ

A more Egyptian-style quick pronunciation may sound like:

law il-maṭar lissa nāzil, mish ha’dar atmashsha fish-shāreʿ

A few notes:

• لو = law
• لسه = lissa
• مش = mish
• هقدر often sounds like ha’dar / haqdar
• في الشارع often runs together in speech

Because this is an Egyptian Arabic sentence, not a Modern Standard Arabic one.

Some clearly Egyptian features are:

• لسه instead of an MSA form like ما زال
• مش for negation
• هقدر with the future marker هـ
• أتمشى as an everyday colloquial verb

A more formal MSA-style sentence would look quite different.

Yes, you could, and it would still be understandable and natural.

Compare:

• لو المطر لسه نازل = if the rain is still coming down
• لو المطر لسه بينزل = if the rain is still falling

Both work.
The version with نازل is very common and conversational in Egyptian.

Yes: the sentence is very straightforward for Egyptian Arabic.

It follows this pattern:

• condition
• result

So:

• لو المطر لسه نازل = condition
• مش هقدر أتمشى في الشارع = result

This is exactly the kind of structure an English speaker would expect from an if sentence, even though the individual Arabic words work a bit differently.

Not perfectly.

A very literal breakdown is:

• لو = if
• المطر = the rain
• لسه = still
• نازل = coming down
• مش = not
• هقدر = I will be able
• أتمشى = walk around / take a walk
• في الشارع = in the street

So a literal gloss is:

• If the rain is still coming down, I won’t be able to walk around in the street.

That helps you understand the Arabic structure, even if the best English translation may be phrased a little differently.