Βρέχομαι όταν βρέχει και δεν έχω ομπρέλα.

Because they come from the same verb family, βρέχω.

In this sentence:

• βρέχομαι = I get wet / I am getting wet
• βρέχει = it rains / it is raining

So Greek is using the same root for both the weather event and the result on the person. That is very natural in Greek, even though English uses two different expressions: it rains and I get wet.

Grammatically, yes: it has middle/passive endings.

But in meaning, it is often best translated naturally into English as I get wet rather than the more literal I am being wetted.

So here:

• βρέχω can mean I wet something
• βρέχομαι means I get wet

This is a very common pattern in Greek: a middle/passive-looking form can describe what happens to the subject, even when English would not use a passive.

Because Greek usually does not need subject pronouns.

The ending of the verb already tells you the subject:

• -μαι in βρέχομαι tells you it is I
• έχω also clearly means I have

So εγώ is not necessary. You could add εγώ for emphasis, but the neutral sentence leaves it out.

Compare:

• Βρέχομαι = I get wet
• Εγώ βρέχομαι = I get wet with extra emphasis on I

In Greek, weather verbs do not normally use a dummy subject like English it.

English says:

• it rains

Greek simply says:

• βρέχει

There is no separate word for it here. The verb by itself expresses the whole idea.

It can feel like either, depending on context.

In a sentence like this, όταν often has a general, repeated sense:

• όταν βρέχει = when it rains / whenever it rains

Since the whole sentence sounds like a general situation, many learners understand it as:

• I get wet whenever it rains and I don’t have an umbrella

So όταν is not only for one single occasion; it can also describe a repeated pattern.

Because Greek present tense can describe a general truth, a habit, or an action happening right now, depending on context.

Here the sentence most naturally sounds habitual or general:

• Βρέχομαι όταν βρέχει και δεν έχω ομπρέλα.
• I get wet when it rains and I don’t have an umbrella.

So the present tense is doing the same kind of job that the English present does in general statements.

δεν is the normal negation word used with indicative verbs.

So:

• έχω = I have
• δεν έχω = I do not have / I don’t have

In Greek, δεν normally goes directly before the verb it negates. That is exactly what happens here.

Because Greek often allows a bare noun after έχω, especially when you mean something nonspecific.

So:

• δεν έχω ομπρέλα = I don’t have an umbrella

This is very natural Greek.

You could also say:

• δεν έχω μια ομπρέλα

but that usually feels more marked or more explicitly like I don’t have an umbrella / even one umbrella.

So the version without μια is simple and idiomatic.

και links the two parts inside the when clause:

• όταν βρέχει
• και δεν έχω ομπρέλα

Together they mean something like:

• when it rains and I don’t have an umbrella

So the idea is not just when it rains, but more specifically when both of these things are true:

1. it is raining
2. I do not have an umbrella

Then the result is:

• βρέχομαι = I get wet

No, Greek word order is more flexible than English word order.

The original sentence is perfectly natural, but other orders are possible, for example:

• Όταν βρέχει και δεν έχω ομπρέλα, βρέχομαι.

This version may sound slightly clearer to an English speaker because it puts the when clause first. Greek allows both.

The original version is still completely normal.

A rough English-friendly pronunciation is:

VRE-ho-me ó-tan VRE-hi ke then É-ho om-BRE-la

A few useful pronunciation points:

• β sounds like English v
• χ in βρέχομαι / βρέχει is not a hard k; it is a Greek h/ch sound
• αι in βρέχει sounds like e
• δεν has th like in this, not like in thin

The main stresses are:

• ΒΡΕχομαι
• Οταν
• ΒΡΕχει
• Εχω
• ομΠΡΕλα

It could technically mean either, because the Greek present tense can cover both.

But without extra context, many people will understand it as a general statement:

• I get wet when it rains and I don’t have an umbrella

If you wanted to make the right now meaning clearer, context would usually do that. For example, if someone is talking about the current situation outside, the same sentence could naturally be understood as happening now.

So the form itself allows both; context decides.