Mañana iré a la ferretería porque necesito una bombilla y otra lámpara para mi cuarto.

Iré is the simple future of ir and means I will go.

In everyday Spanish, voy a ir is also very common and usually means almost the same thing. So both of these are natural:

• Mañana iré a la ferretería...
• Mañana voy a ir a la ferretería...

The version with iré is a bit more compact and slightly more formal or neutral in tone.

It can mean either one, depending on context.

• mañana = tomorrow
• la mañana = the morning
• por la mañana = in the morning

Here, mañana means tomorrow, because it appears by itself and the verb is in the future: iré.

Spanish often puts time expressions at the beginning to set the scene, just like English does in sentences such as Tomorrow, I’ll go...

You could also say:

• Iré mañana a la ferretería...

That is also correct. Putting mañana first simply gives it a little more prominence.

Because the verb ir normally uses a to show where someone is going:

• ir a = to go to

So:

• ir a la ferretería = to go to the hardware store

Also, ferretería is feminine, so it takes la.

A useful detail:

• a + el = al
• a + la stays a la

So:

• Voy al supermercado.
• Voy a la ferretería.

Because here it means because, and that is written as porque: one word, no accent.

Compare:

• porque = because
• por qué = why

Examples:

• Voy porque lo necesito. = I’m going because I need it.
• ¿Por qué vas? = Why are you going?

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

• necesito already means I need
• the ending -o tells you it is yo

So Spanish does not need to say yo unless the speaker wants emphasis, contrast, or extra clarity.

The same idea applies to iré:

• iré already means I will go

In Spain Spanish:

• bombilla usually means light bulb
• lámpara usually means lamp or sometimes a light fitting

So the sentence is talking about buying:

• a bulb
• and another lamp

That distinction is normal in Spain.

Because otro/otra already includes the idea of another or one more.

So Spanish normally says:

• otra lámpara = another lamp

Not:

• una otra lámpara

Also, otra has to agree with lámpara, which is feminine singular.

Compare:

• otro libro
• otra lámpara
• otros libros
• otras lámparas

Usually, yes. Otra often implies an additional one or one more.

So the natural reading is that the speaker already has a lamp and needs another one.

Depending on context, it can also mean a different lamp, but an additional lamp is the most likely idea here.

Here para means for and shows purpose or intended use.

So:

• para mi cuarto = for my room

The idea is that the bulb and lamp are intended for that room.

This is a very common use of para:

• Es para ti. = It’s for you.
• Necesito una mesa para el comedor. = I need a table for the dining room.

Yes, cuarto can mean different things:

• room
• fourth
• quarter

Here, because of the context para mi cuarto, it clearly means room.

In everyday Spanish, cuarto can often mean room or bedroom. Another common word is habitación.

Because mi without an accent is the possessive adjective meaning my.

• mi cuarto = my room

Mí with an accent is a pronoun meaning me, usually after a preposition:

• para mí = for me
• sin mí = without me

So these are different words:

• mi = my
• mí = me