Si deja de llover, dejaré el paraguas en el paraguero de la entrada y regaré ese macetero.

Because si without an accent means if.

Spanish also has sí with an accent, which usually means yes. So:

• si = if
• sí = yes

In this sentence, it is clearly the conditional word if, so it has no accent.

In Spanish, a real future condition normally uses:

• si + present indicative
• then a main clause in the future, present, or imperative

So the pattern is:

• Si deja de llover, dejaré...
• If it stops raining, I will...

This is standard Spanish grammar. After si meaning if, Spanish does not normally use the future tense in this kind of sentence.

A useful comparison:

• Si llueve, no saldré. = If it rains, I won’t go out.
• Si deja de llover, dejaré el paraguas... = If it stops raining, I’ll leave the umbrella...

Because this is a normal, possible condition, not a hypothetical or contrary-to-fact one.

With si meaning if, Spanish usually uses:

• present indicative for real/open conditions
• imperfect subjunctive only in more hypothetical or unreal conditions

So:

• Si deja de llover, dejaré... = real possibility
• Si dejara/dejase de llover, dejaría... = more hypothetical, like if it were to stop raining

English learners often expect the subjunctive after if, but in Spanish that is not the usual pattern with ordinary si clauses.

There is no stated subject, and that is normal.

With weather expressions, English uses a dummy subject:

• it is raining
• it stops raining

Spanish usually does not use an equivalent dummy subject. So deja de llover simply means it stops raining, even though no word for it appears.

Because those are the actions the speaker will do later, if the condition is met.

The sentence has this structure:

• condition: Si deja de llover
• result: dejaré... y regaré...

So the future tense makes sense: once the rain stops, the speaker will then do those two things.

Both verbs are regular future forms:

• dejaré = I will leave
• regaré = I will water

Because Spanish often leaves subject pronouns out when the verb ending already makes the subject clear.

Here:

• dejaré already means I will leave
• regaré already means I will water

So yo is unnecessary unless you want emphasis or contrast.

For example:

• Si deja de llover, dejaré el paraguas... = neutral
• Si deja de llover, yo dejaré el paraguas... = more emphatic, maybe contrasting with someone else

No. It is the same verb, but it is used in two different ways.

1. dejar de + infinitive
   This means to stop doing something.
   So deja de llover = it stops raining

2. dejar + object + place
   This means to leave or to put/leave something somewhere.
   So dejaré el paraguas en el paragüero = I’ll leave the umbrella in the umbrella stand

This is very common in Spanish: one verb can have different meanings depending on the structure around it.

In standard spelling, yes: paragüero is the usual form for umbrella stand.

The ü matters because it shows that the u is pronounced in güe:

• güe = pronounced roughly like gwe
• without the diaeresis, gue usually makes the u silent

So standard Spanish spelling is:

• paragüero = umbrella stand

If you saw paraguero, it is best treated as a non-standard spelling or a spelling slip.

It does look plural, but paraguas can be singular or plural. The article tells you which one it is.

• el paraguas = the umbrella
• los paraguas = the umbrellas

So paraguas is one of those nouns whose form often stays the same in singular and plural.

It literally means of the entrance, but in natural English it usually means something like:

• by the entrance
• in the entryway
• at the entrance

So:

• el paragüero de la entrada = the umbrella stand by the entrance / in the entrance area

Spanish often uses de + noun to describe where something belongs or where it is associated with.

Because ese means that, while este means this.

Very roughly:

• este = this, near the speaker
• ese = that, not especially near the speaker
• aquel = that over there, farther away

So ese macetero means that planter / that plant pot / that container, referring to a specific one that is already known from the situation or context.

In Spain, the most basic word for a flowerpot is maceta.

macetero can mean a few related things, such as:

• a planter
• a pot holder or stand
• a container or structure for plants/pots

In everyday use, speakers do not always keep the distinction perfectly strict, but generally:

• maceta = flowerpot
• macetero = planter / holder / larger plant container

So here macetero suggests something a bit more like a planter or plant container than just a simple pot.

They show where the stress goes and mark the future-tense forms correctly.

So:

• dejaré is stressed on the last syllable: de-ja-RÉ
• regaré is stressed on the last syllable: re-ga-RÉ

These accents are a normal part of the future endings:

• -é
• -ás
• -á
• -emos
• -éis
• -án

So the accent is not optional here; it is part of the correct spelling.

Yes, but it changes the meaning and the grammar.

• Si deja de llover... = If it stops raining...
  This presents it as a condition.

• Cuando deje de llover... = When it stops raining...
  This sounds more like the speaker expects it to happen.

Notice the verb difference too:

• after si: deja → indicative
• after future cuando: deje → subjunctive

So both are possible, but they are not interchangeable in every situation.