שים את הכרטיס בארנק לפני שאתה יוצא מהבית.

שים is the masculine singular imperative of לשים (to put / to place).

So the sentence is giving a command to one male person:

• שים = put!

This verb is a little irregular-looking, so learners often just memorize:

• לשים = to put
• שים = put! (to one male)
• שימי = put! (to one female)
• שימו = put! (to more than one person, in common modern usage)

Here את is the direct object marker. It does not mean you here.

Hebrew uses את before a definite direct object, usually one with ה־ (the), a name, or something otherwise specific.

So:

• שים את הכרטיס = put the card
• את marks הכרטיס as the specific thing being put

A useful comparison:

• שים כרטיס בארנק = put a card in a wallet
• שים את הכרטיס בארנק = put the card in the wallet

הכרטיס means the card.

It is made of:

• כרטיס = card / ticket
• ה־ = the

So:

• כרטיס = a card
• הכרטיס = the card

Because the object is definite, Hebrew uses את before it: את הכרטיס.

בארנק is made from:

• ב־ = in
• הארנק = the wallet

When ב־ comes before a noun with ה־, they usually combine into one word:

• ב + הארנק = בארנק

So בארנק literally means in the wallet.

This is very common in Hebrew:

• בבית = in the house / at home
• בספר = in the book
• במכונית = in the car

Hebrew often uses the where English would naturally use your, especially when the ownership is obvious from context.

So in a sentence like this:

• בארנק can naturally be understood as in the wallet or in your wallet
• מהבית can naturally mean from the house or from home / from your home

If you want to say your wallet explicitly, you can say:

• בארנק שלך = in your wallet

But in everyday Hebrew, leaving out שלך is often perfectly natural when the meaning is clear.

לפני means before.

When Hebrew wants to say before you do something, it often uses:

• לפני ש... = before ...

So:

• לפני שאתה יוצא = before you leave / before you go out

The ש here is a connecting word, roughly like that in some English structures, but in natural English we usually just translate the whole thing as before plus a clause.

You will see this pattern a lot:

• אחרי ש... = after ...
• כשהוא בא... = when he comes / when he is coming ...
• לפני שאני הולך... = before I go ...

In the present tense, Hebrew verbs usually show gender and number, but not person clearly enough on their own.

So:

• יוצא can mean going out / leaves for a masculine singular subject
• by itself, it does not clearly tell you whether the subject is I, you, or he, depending on context

That is why the pronoun אתה is helpful and often necessary:

• אתה יוצא = you are leaving / you leave

Compare this with the future tense:

• תצא already clearly means you will leave (masculine singular), so the pronoun is not necessary

Yes. לפני שתצא מהבית is also correct and very natural.

The two versions are close in meaning:

• לפני שאתה יוצא מהבית = before you leave / before you’re leaving the house
• לפני שתצא מהבית = before you leave the house

For many everyday situations, they are interchangeable.

The version in your sentence uses אתה יוצא, which is very common and conversational.
The version with שתצא may feel a bit tighter or more straightforward in some contexts.

Because the sentence is addressed to a male singular person.

Hebrew verbs in the present tense agree with the subject in gender and number:

• אתה יוצא = you leave / you are leaving (to one male)
• את יוצאת = you leave / you are leaving (to one female)

So if you were speaking to a woman, the sentence would be:

• שימי את הכרטיס בארנק לפני שאת יוצאת מהבית.

It is made from:

• מ־ = from
• הבית = the house / the home

So:

• מהבית = from the house

But in natural English, בית / הבית often means home, not just a physical house.
So יוצא מהבית is very naturally understood as:

• leaving home
• going out of the house

Depending on context, English may translate it as either house or home.

The sentence uses a very normal Hebrew order:

• שים = command
• את הכרטיס = the object
• בארנק = place/location
• לפני שאתה יוצא מהבית = time clause

So the structure is basically: Put + the card + in the wallet + before you leave the house

This is the most straightforward order for a learner to use. Hebrew does allow some flexibility, but this version sounds natural and standard.