כשהוא יוצא מהבית, הוא תמיד בודק אם הכרטיס בארנק.

כשהוא means when he.

It is made from:

• כש־ = when / as
• הוא = he

So:

• כשהוא יוצא מהבית = when he leaves the house / when he goes out of the house

This is a very common Hebrew structure:

• כשאני... = when I...
• כשאתה... = when you...
• כשהיא... = when she...

In Hebrew, the present tense is often used for habitual or general actions, especially in sentences like this.

So כשהוא יוצא מהבית literally looks like when he is going out of the house, but in natural English it is usually translated as:

• when he leaves the house
• whenever he leaves the house

Because the sentence describes something he does regularly, Hebrew uses the present form naturally.

Also:

• יוצא is the masculine singular present form of לצאת = to go out / to leave

מהבית is a combination of:

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

So:

• מ + הבית = מהבית

This is completely normal in Hebrew.

In context, יוצא מהבית means:

• goes out of the house
• leaves home

Even though Hebrew literally says from the house, English often says leaves the house or leaves home.

The sentence says:

• כשהוא יוצא מהבית, הוא תמיד בודק...

A native English speaker might expect:

• When he leaves the house, always checks...

But Hebrew usually prefers to repeat the subject clearly in the main clause:

• When he leaves the house, he always checks...

So the second הוא is natural and helps mark the start of the main clause.

Hebrew often repeats the subject in this kind of sentence more readily than English does.

בודק is the masculine singular present-tense form of the verb לבדוק, which means to check.

So:

• הוא בודק = he checks / he is checking

Because the subject is הוא (he), the masculine singular form is used.

Related present-tense forms:

• בודק = masc. singular
• בודקת = fem. singular
• בודקים = masc. plural / mixed plural
• בודקות = fem. plural

Here אם means whether / if in an indirect yes-no question.

So:

• הוא תמיד בודק אם הכרטיס בארנק = he always checks if/whether the card is in the wallet

This is different from a conditional if like:

• If it rains, he stays home

In Hebrew, אם can also mean conditional if, so the meaning depends on context.

In this sentence, it clearly means whether:

• he checks whether the card is in the wallet

Because in Hebrew, the verb to be is usually omitted in the present tense.

So:

• הכרטיס בארנק literally = the card in the wallet
• natural English = the card is in the wallet

This is one of the most important differences between Hebrew and English.

Compare:

• הוא בבית = he is at home
• הספר על השולחן = the book is on the table
• הכרטיס בארנק = the card is in the wallet

But in past or future tense, Hebrew does use forms of to be:

• הכרטיס היה בארנק = the card was in the wallet
• הכרטיס יהיה בארנק = the card will be in the wallet

בארנק means in the wallet.

It is made from:

• ב־ = in
• הארנק = the wallet

Together:

• ב + הארנק = בארנק

So the definite article ה־ is still there, but it combines with the preposition.

This kind of contraction is very common:

• בבית = in a house / at home
• בבית הספר = in the school
• בארנק = in the wallet

Yes. כרטיס can mean:

• card
• ticket
• sometimes other card-like items depending on context

So הכרטיס literally could be:

• the card
• the ticket

In this sentence, because it is in the wallet (בארנק), the most natural meaning is the card.

Context usually makes it clear:

• כרטיס אשראי = credit card
• כרטיס נסיעה = travel ticket
• כרטיס כניסה = entrance ticket

תמיד means always, and its position here is very natural:

• הוא תמיד בודק = he always checks

In Hebrew, adverbs like תמיד often come:

• after the subject
• before the main verb

So this word order is very common:

• אני תמיד זוכר = I always remember
• היא תמיד מגיעה מוקדם = she always arrives early
• הוא תמיד בודק = he always checks

You may also see other word orders in Hebrew for emphasis, but this is the standard neutral one.

In this sentence, it really has a habitual sense, so in English it is often understood as:

• whenever he leaves the house, he always checks...

But Hebrew does not need a separate word here for whenever. The habitual meaning comes from the whole sentence, especially from:

• תמיד = always

So:

• כשהוא יוצא מהבית can be translated as when he leaves the house
• but in context, it often feels like whenever he leaves the house

Yes, but it would mean something slightly different.

• כשהוא יוצא מהבית = when he leaves / as he is leaving the house
• לפני שהוא יוצא מהבית = before he leaves the house

So the original sentence suggests the checking happens at the time of leaving, while לפני שהוא יוצא places it earlier.

Both can make sense in real life, but they are not identical.

Yes, it is very natural.

It sounds like a normal spoken or written sentence describing a routine:

• כשהוא יוצא מהבית, הוא תמיד בודק אם הכרטיס בארנק.

A native speaker might also say similar everyday variations, such as:

• לפני שהוא יוצא מהבית, הוא תמיד בודק אם הכרטיס בארנק.
• כשהוא יוצא, הוא תמיד בודק שהכרטיס בארנק.

But the original sentence is clear, correct, and natural.

Sometimes colloquial Hebrew uses ש־ after verbs like לבדוק when the meaning is more like make sure that:

• הוא בודק שהכרטיס בארנק
  = he checks/makes sure that the card is in the wallet

But אם is better when the meaning is specifically:

• checks whether the card is in the wallet

So:

• אם = whether / if
• ש־ = that

In many everyday situations, both may be heard, but they are not exactly the same in nuance.