לפני שאתם יוצאים, תבדקו עוד פעם אם יש מלח, סוכר וסכין במטבח אצלכם.

This is very common in Hebrew. After time expressions like לפני, אחרי, and כש, Hebrew often uses a present-tense form where English would say before you leave / when you arrive / after you finish.

So:

לפני שאתם יוצאים
literally: before you are going out
natural English: before you go out / before you leave

The present form here does not mean the action is happening right now. It is just the normal Hebrew way to express this kind of time clause.

תבדקו is formally a 2nd-person plural future form, but in everyday Hebrew it is very often used as a command or instruction:

• תבדקו = check
• תכתבו = write
• תבואו = come

So even though it looks like you will check, in context it means check.

Compared with בדקו, תבדקו often sounds a little more conversational, less sharp, or more natural in spoken Hebrew. Both can work, but תבדקו is extremely common.

עוד פעם means again or one more time.

Word by word:

• עוד = more / another
• פעם = time / one time / once

So תבדקו עוד פעם means check again or check one more time.

A close synonym is שוב.
For example:

• תבדקו עוד פעם = check again
• תבדקו שוב = check again

עוד פעם is slightly more conversational.

Here it means whether.

Hebrew uses אם for both:

• conditional if
• indirect-question whether

So in this sentence:

תבדקו עוד פעם אם יש...
= check again whether there is...

It is not a condition like if it rains. It introduces the thing being checked.

Because יש is not a normal verb that changes for singular and plural. It is an existential word meaning there is / there are, and it stays the same.

So Hebrew says:

• יש מלח = there is salt
• יש סכינים = there are knives
• יש מלח, סוכר וסכין = there is / are salt, sugar, and a knife

English changes between there is and there are, but Hebrew just uses יש.

Because these nouns are not direct objects in the usual sense, and they are not definite.

The structure is:

אם יש מלח...
= whether there is salt...

Here יש is an existential structure, not a direct-object structure.

Also, את is used before a definite direct object, for example:

• בדקתי את הסכין = I checked the knife

But this sentence is not saying check the knife. It is saying check whether there is a knife. So את is not used.

Because the sentence is asking whether those things exist in the kitchen, not referring to specific already-known items.

So:

• מלח = salt
• סוכר = sugar
• סכין = a knife

This sounds like make sure there is some salt, some sugar, and a knife.

If you said המלח, הסוכר והסכין, it would sound more like you mean specific items already identified by the speaker and listener: the salt, the sugar, and the knife.

אצלכם literally means with you (plural), but very often it means at your place / in your home / where you are.

So:

• במטבח אצלכם = in the kitchen at your place
• very natural English: in your kitchen

This use of אצל for location is extremely common in Hebrew.

Both are possible, but they are a little different in feel.

• במטבח שלכם = in your kitchen
  This is a straightforward possessive: your kitchen.

• במטבח אצלכם = in the kitchen at your place
  This emphasizes location: the kitchen in your home / where you live.

In everyday Hebrew, אצלכם is very natural when talking about someone’s home or place. So this wording sounds idiomatic and conversational.

Hebrew often drops subject pronouns, but sometimes they are included for clarity or emphasis.

Here אתם makes it very clear who is being addressed:

לפני שאתם יוצאים
= before you (plural) go out

It can sound a little fuller or clearer than just saying לפני שיוצאים or another reduced version. Since the sentence is giving instructions to a group, keeping אתם is very natural.

אתם and יוצאים are masculine plural forms.

In Hebrew, masculine plural is used for:

• a group of men
• a mixed group of men and women
• sometimes as the default plural in general speech

If the speaker were addressing only women, standard Hebrew would use אתן and יוצאות in that part of the sentence.

It can mean either go out or leave, depending on context.

The verb לצאת is broad. It can mean:

• go out
• leave
• head out

So:

לפני שאתם יוצאים
could be understood as:

• before you go out
• before you leave
• before you head out

All of these are reasonable translations depending on the situation.