אני בודקת את הכתובת פעמיים לפני שאני יוצאת מהבית.

Because the speaker is understood to be female.

In Hebrew present tense, verbs agree with the subject in gender and number. So:

• אני בודקת = I check / I am checking (female speaker)
• אני יוצאת = I leave / I am leaving / I go out (female speaker)

If the speaker were male, it would be:

• אני בודק
• אני יוצא

Hebrew does this in the present tense even with אני.

It would be:

אני בודק את הכתובת פעמיים לפני שאני יוצא מהבית.

Only the present-tense verb forms change:

• בודקת → בודק
• יוצאת → יוצא

Everything else stays the same.

את here is the direct object marker. It comes before a definite direct object.

So in:

אני בודקת את הכתובת

the word הכתובת means the address, which is definite because of ה־ = the.

Hebrew marks that with את:

• את הכתובת = the address (as a direct object)

It usually does not get translated into English.

Compare:

• אני בודקת כתובת = I check an address
• אני בודקת את הכתובת = I check the address

Yes, Hebrew can sometimes leave subject pronouns out, but in the present tense they are often kept because the verb does not clearly show person.

For example, בודקת by itself could mean:

• I check
• you check (to a woman)
• she checks

So אני helps make the subject clear.

That is why the sentence has:

• אני בודקת
• לפני שאני יוצאת

The second אני is especially helpful because it makes the subordinate clause explicit: before I leave.

פעמיים means twice.

It comes from פעם, which can mean time in the sense of occurrence.

Useful related forms:

• פעם אחת = once
• פעמיים = twice
• שלוש פעמים = three times

So פעמיים is a very common adverb meaning two times.

Hebrew commonly uses לפני ש־ + a full clause to mean before ....

So:

• לפני שאני יוצאת מהבית = before I leave the house / before I go out of the house

This is very natural Hebrew.

The ש־ here is the subordinating word that links the clause, and שאני is really:

• ש + אני

So literally it is something like:

• before that I leave

English often uses either:

• before I leave
• before leaving

Hebrew usually prefers the full clause in this kind of sentence.

In Hebrew, the present tense is often used for habitual actions or general routines.

This sentence describes a regular habit:

• I check the address twice before I leave the house.

Because it is a routine, Hebrew uses present-tense forms:

• בודקת
• יוצאת

If you were talking about one specific future occasion, Hebrew would more likely use the future in the second clause, for example:

• לפני שאצא מהבית = before I leave the house

So the sentence as written feels like a habitual present.

מהבית is made from:

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

Together:

• מהבית = from the house / from home

In Hebrew, prepositions are often attached directly to the following word, especially short ones like:

• ב־ = in
• ל־ = to
• מ־ = from

So instead of writing separate words, Hebrew combines them.

Also, with the verb לצאת (to go out / to leave), Hebrew often says literally:

• לצאת מהבית = to go out from the house

That is the natural Hebrew way to express leave the house.

It can be understood as either house or home, depending on context.

Hebrew בית often covers both ideas:

• the physical house
• one’s home

So מהבית can sound like:

• from the house
• from home

In this sentence, English might naturally say either:

• before I leave the house
• before I leave home

The dictionary forms are the infinitives:

• בודקת → לבדוק = to check
• יוצאת → לצאת = to go out / to leave

This is useful because Hebrew dictionaries normally list verbs by the infinitive, not by the present-tense form.

So if you wanted to look these up, you would search for:

• לבדוק
• לצאת

The given word order is very natural:

אני בודקת את הכתובת פעמיים לפני שאני יוצאת מהבית.

Hebrew word order is somewhat flexible, but not every alternative sounds equally natural.

Here, placing פעמיים after the object works well:

• אני בודקת את הכתובת פעמיים...

That is a normal place for an adverb like twice.

You might sometimes hear different placements for emphasis, but the sentence as given is the most straightforward and neutral way to say it.