Cuando vamos al campo, mi tía siempre lleva un botiquín pequeño para curar heridas y picaduras.

Both can be possible in Spanish, but they mean slightly different things.

• Cuando vamos al campo uses the present tense to talk about a habitual action:
  Whenever we go to the countryside...
• Cuando vayamos al campo uses the present subjunctive and usually refers to a future event:
  When we go to the countryside (next time / in the future)...

In your sentence, the idea is a repeated routine, so cuando vamos is the natural choice.

Spanish often leaves out subject pronouns because the verb ending already shows who is doing the action.

• vamos = we go / we are going
• The ending -amos tells you it is nosotros

So Spanish usually says:

• Vamos al campo rather than Nosotros vamos al campo

Including nosotros is possible, but it is usually only added for emphasis or contrast.

Al is a contraction of a + el.

• a = to
• el = the
• a + el = al

So:

• vamos al campo = we go to the countryside

This contraction is mandatory in Spanish whenever a is followed by the masculine singular article el.

Not always. El campo can mean:

• the countryside
• the country
• rural areas
• sometimes a field

In this sentence, vamos al campo most naturally means we go to the countryside or out into the country, not necessarily to one specific field.

This is a very common expression in Spanish.

In modern standard Spanish, possessives like mi, tu, su, nuestro usually go directly before the noun without an article.

• mi tía = my aunt

You do not normally say la mi tía in standard Spanish.

Compare:

• mi tía = my aunt
• tu casa = your house
• su coche = his/her/their car

Siempre means always, and in Spanish adverbs like this are often placed before the verb:

• mi tía siempre lleva... = my aunt always carries...

Other positions are sometimes possible, but this is the most normal and neutral one.

Compare:

• Siempre lleva un botiquín.
• Mi tía siempre lleva un botiquín.

Both are natural.

This is about the difference between llevar and traer.

• llevar = to take / to carry something to a place, or to have it with you
• traer = to bring something toward the speaker or another reference point

Here, the idea is that the aunt carries a first-aid kit with her when they go out, so lleva is the right choice.

• mi tía siempre lleva un botiquín = my aunt always carries a first-aid kit

If you said trae, it would suggest bringing it toward some location or person in a way that does not fit as well here.

Un botiquín usually means a first-aid kit or medicine kit.

In Spain, it commonly refers to a small kit with things like:

• bandages
• antiseptic
• plasters / adhesive bandages
• basic medicines

So un botiquín pequeño is a small first-aid kit.

In Spanish, most descriptive adjectives normally come after the noun.

• un botiquín pequeño = a small first-aid kit

That is the usual order.

If an adjective comes before the noun, it often sounds more literary, subjective, or changes nuance. But here, pequeño is just a straightforward description of size, so it naturally comes after the noun.

After para, Spanish often uses an infinitive when the subject stays general or is understood:

• para curar = to treat / to heal

So:

• lleva un botiquín pequeño para curar heridas y picaduras
  = she carries a small first-aid kit to treat wounds and bites/stings

You would use para que + subjunctive when you need a new subject or a full clause:

• Lleva un botiquín para que podamos curar heridas.
  = She carries a first-aid kit so that we can treat wounds.

But in your sentence, para + infinitive is simpler and more natural.

Not exactly. Curar can mean to cure, but in everyday contexts like this it often means:

• to treat
• to heal
• to take care of

With heridas y picaduras, it means something like:

• to treat wounds and bites/stings

English cure can sound too strong in some contexts, so treat is often the best translation here.

• heridas = wounds, cuts, injuries
• picaduras = bites or stings

In Spain, picadura can refer to things like:

• mosquito bites
• insect bites
• stings

So heridas y picaduras is a very natural pairing in a first-aid context.

Spanish often leaves out the article when talking about things in a general sense, especially after expressions like para + infinitive.

So:

• para curar heridas y picaduras = to treat wounds and bites/stings

This sounds general: wounds and bites in general.

You could say las heridas y las picaduras, but that would sound more specific, as if you were referring to particular wounds and bites already known in the conversation.

Here it is being used for habitual actions.

The sentence describes something that happens regularly:

• Cuando vamos al campo, mi tía siempre lleva...
• Whenever we go to the countryside, my aunt always carries...

Spanish often uses the present tense this way to talk about routines, repeated events, and general truths.

The accent marks show stress.

• tía is stressed on the í: TI-a
• botiquín is stressed on the last syllable: bo-ti-QUÍN

Without the accent marks, the pronunciation rules would suggest different stress patterns, so the written accent is necessary.

These accents are part of the correct spelling and should always be written.

No. In standard Spanish, a + el must become al.

So:

• correct: vamos al campo
• incorrect: vamos a el campo

The only common contraction like this with articles is:

• a + el = al
• de + el = del

Yes. Picadura is often used broadly for the mark or injury caused by an insect or similar creature.

Depending on context, it may be translated as:

• bite
• sting

For example:

• picadura de mosquito = mosquito bite
• picadura de abeja = bee sting

So picaduras is a very useful general word here.