En caso de que mañana siga lloviendo, estudiaré en casa y dejaré el paraguas junto al perchero.

Because en caso de que is followed by the subjunctive when it refers to a possible or uncertain situation.

Here, the rain tomorrow is not a fact; it is only a possibility. That is why Spanish uses:

• En caso de que mañana siga lloviendo

and not the indicative.

A native English speaker can think of it as: in case it keeps raining tomorrow / if it should still be raining tomorrow.

Both are possible, but they are not exactly the same in tone.

• En caso de que = in case, if it happens that
• Si = if

En caso de que sounds a bit more formal and a bit more like preparing for a possibility.

Compare:

• En caso de que mañana siga lloviendo... → In case it keeps raining tomorrow...
• Si mañana sigue lloviendo... → If it keeps raining tomorrow...

Also, the grammar changes:

• en caso de que
  • subjunctive → siga
• si
  • indicative → sigue

So you could say:

• Si mañana sigue lloviendo, estudiaré en casa...

but not Si mañana siga lloviendo.

Because seguir + gerundio means to keep doing something or to continue doing something.

So:

• llueva = it rains
• siga lloviendo = it keeps raining / it continues raining

The sentence is not just talking about rain happening; it suggests that the rain may still be ongoing tomorrow.

This structure is very common:

• seguir estudiando = to keep studying
• seguir trabajando = to keep working
• seguir lloviendo = to keep raining

It comes from seguir (to continue / to follow).

Siga is the present subjunctive form for él / ella / usted.

A quick pattern:

• yo sigo
• tú sigues
• él/ella sigue

Present subjunctive:

• yo siga
• tú sigas
• él/ella siga

It looks irregular because seguir is a stem-changing verb.

Because the main actions happen in the future.

• estudiaré = I will study

• dejaré = I will leave / put

  The sentence is talking about a possible future situation tomorrow, and then what the speaker will do.

Spanish often uses the future tense here, especially in clear written examples. In everyday speech, Spanish can also use the present tense for near-future meaning if the time is already clear:

• Mañana estudio en casa...

But estudiaré and dejaré are perfectly natural and very clear.

En casa is the normal idiomatic way to say at home.

• estudiaré en casa = I’ll study at home

If you say en la casa, it usually sounds more like in the house/building, focusing on the physical place rather than the idea of home.

So:

• en casa = at home
• en la casa = in the house

Yes, but in this context dejar often means to leave something somewhere, to put something down, or to place it and not carry it anymore.

So:

• dejaré el paraguas junto al perchero

means something like:

• I’ll leave the umbrella next to the coat rack
• I’ll put the umbrella by the coat stand

It does not mean abandon in a dramatic sense here. It is just placing the umbrella somewhere.

Junto a means next to, beside, or by.

So:

• junto al perchero = next to the coat rack / coat stand

The form al is just a contraction:

• a + el = al

So:

• junto a el perchero → incorrect
• junto al perchero → correct

This contraction happens whenever a is followed by el.

In Spain, perchero usually means a coat rack, coat stand, or a place with hooks for coats, jackets, umbrellas, and similar items.

Depending on the context, it could be:

• a standing coat rack
• a wall-mounted set of hooks
• an entryway rack

So junto al perchero suggests the umbrella is being left near the place where coats are hung.

Yes, mañana could go in different places, but the sentence as written is very natural.

• En caso de que mañana siga lloviendo...

This places mañana close to the condition and makes it clear that the possible rain is tomorrow.

You could also hear:

• En caso de que siga lloviendo mañana...

That is also correct. The meaning is basically the same, though the rhythm changes slightly.

Spanish word order is often more flexible than English, especially with time expressions like mañana.

Because the sentence begins with a dependent clause:

• En caso de que mañana siga lloviendo

and then moves to the main clause:

• estudiaré en casa y dejaré el paraguas junto al perchero

In Spanish, when a subordinate clause comes first, it is very normal to separate it with a comma. It helps readability and matches standard punctuation.

Because Spanish usually omits subject pronouns when they are not needed.

The verbs already show the subject:

• estudiaré = I will study
• dejaré = I will leave

So once the subject is understood, Spanish does not normally repeat yo.

You could say:

• yo estudiaré en casa y dejaré el paraguas...

but it is usually unnecessary unless you want emphasis or contrast.

Yes, in everyday Spanish that is often possible if the time reference is already clear.

For example:

• En caso de que mañana siga lloviendo, estudio en casa y dejo el paraguas junto al perchero.

This can sound more conversational, especially when talking about plans.

However, the original version with estudiaré and dejaré is completely correct and slightly more explicit or formal in tone.