Abans de sortir, he d'agafar la clau de la bossa.

Because after abans when Catalan means before doing something, it normally uses de + infinitive.

So:

• abans de sortir = before leaving / before going out

This is a very common pattern:

• abans de menjar = before eating
• abans de dormir = before sleeping

If a full clause follows instead of an infinitive, Catalan usually changes structure:

• abans que surti = before he/she leaves

So in your sentence, abans de sortir is the normal and correct form.

Catalan often leaves out subject pronouns because the verb ending already shows who the subject is.

Here, he already tells you the subject is I.

So:

• (jo) he d'agafar... = I have to take...

Adding jo is possible, but it usually adds emphasis or contrast:

• Jo he d'agafar la clau, no tu. = I have to take the key, not you.

So the version without jo is very normal and natural.

It is the structure haver de + infinitive, which expresses obligation or necessity, like have to in English.

So:

• he d'agafar = I have to take / get
• has d'agafar = you have to take
• ha d'agafar = he/she has to take

Here:

• he = first-person singular present of haver
• d'agafar = de + agafar

A very useful thing to notice is that he d'agafar is different from he agafat:

• he d'agafar = I have to take
• he agafat = I have taken

That little de changes the meaning a lot.

If you are aiming for standard Catalan, he d'agafar is the best choice.

Standard Catalan normally expresses have to with:

• haver de + infinitive

So:

• he d'agafar = standard and recommended

Forms like tinc que agafar are often avoided in standard Catalan because they are usually seen as influenced by Spanish. As a learner, haver de is the safe and correct pattern to use.

Because de is shortened before a word that begins with a vowel.

So:

• de + agafar → d'agafar

This kind of contraction is very common in Catalan:

• l'amic from el + amic
• d'aquí
• m'agrada

It makes pronunciation smoother and is part of normal spelling.

Not necessarily. Agafar is a very common Catalan verb with a broad meaning range. Depending on context, it can mean:

• take
• get
• pick up
• grab
• sometimes even catch

In this sentence, English translations like take, get, or pick up are all possible depending on the context.

So agafar is broader and more neutral than English grab, which can sound more sudden or forceful.

This is a very good question, because de is a very flexible preposition in Catalan. It can correspond to several English ideas, including:

• of
• from
• about
• made of

In la clau de la bossa, the phrase can be understood in more than one way:

• the bag's key / the key for the bag
• the key from the bag / the key that is in the bag

So this part can be a little ambiguous without context.

If you want to make out of the bag especially clear, Catalan often uses a clearer wording, for example:

• he de treure la clau de la bossa = I have to take the key out of the bag
• he d'agafar la clau que hi ha a la bossa = I have to take the key that is in the bag

So the original sentence is understandable, but this is exactly the kind of place where context matters.

Because clau is a feminine noun in Catalan.

So you say:

• la clau = the key
• una clau = a key
• aquesta clau = this key

This is a good reminder that noun gender in Catalan is not always predictable just from the ending. Even though many feminine nouns end in -a, not all of them do.

In the sentence, both nouns are feminine:

• la clau
• la bossa

Yes. Catalan word order is fairly flexible.

Your sentence begins with a time expression:

• Abans de sortir, ... = Before leaving, ...

That is perfectly natural, and it emphasizes the time frame first.

You could also say:

• He d'agafar la clau de la bossa abans de sortir.

That version is also natural. The meaning is basically the same, but the focus is slightly different.

The comma after Abans de sortir is normal because that opening phrase sets the scene before the main clause.