אני בטוח שהמפתח שלך בתיק.

Hebrew often leaves out the verb to be in the present tense.

So אני בטוח שהמפתח שלך בתיק literally looks like:

I sure that-the-key your in-the-bag

But in natural English, that becomes:

I’m sure that your key is in the bag.

This is completely normal in Hebrew. In the present tense, sentences like:

• הוא בבית = He is at home
• הספר על השולחן = The book is on the table

do not need a separate word for is.

שה־ means that.

In שהמפתח שלך בתיק, it introduces the clause that your key is in the bag.

So:

• אני בטוח = I’m sure
• שהמפתח שלך בתיק = that your key is in the bag

A very useful thing to know is that ש־ is attached directly to the next word, so:

• ש + המפתח → שהמפתח

This is very common in Hebrew.

Because בטוח agrees with the speaker.

• אני בטוח = a male speaker says I am sure
• אני בטוחה = a female speaker says I am sure

So this sentence is being said by a male speaker. If a woman were saying it, it would be:

אני בטוחה שהמפתח שלך בתיק.

This is an important feature of Hebrew: adjectives often agree in gender with the person or thing they describe.

In Hebrew, possessive words like שלי, שלך, שלו, שלה usually come after the noun.

So:

• המפתח שלך = your key
• literally: the key of yours

This is the normal Hebrew structure.

Compare:

• הספר שלי = my book
• הטלפון שלו = his phone
• החברה שלה = her friend / her company (depending on context)

So המפתח שלך is exactly how Hebrew normally says your key.

The ה־ is the definite article, meaning the.

So:

• מפתח = a key / key
• המפתח = the key

In Hebrew, when you use שלך after a noun, it is very common to make the noun definite:

• המפתח שלך = your key

This is the normal way to say it. Hebrew often treats possessed nouns as definite.

בתיק means in the bag or in the case, depending on context.

It is made from:

• ב־ = in
• התיק = the bag / the case

These combine into:

• ב + התיק → בתיק

So בתיק is a contraction meaning in the bag.

This is very common in Hebrew with prepositions:

• בבית = in the house
• בספר = in the book
• בשולחן is not used for on the table; that would be על השולחן — so always learn the preposition together with the expression

Here, בתיק definitely has the sense in the bag / in the case, not just in a bag.

Because the form shows it.

• בתיק = ב + התיק = in the bag
• בתיק can sometimes also look identical to in a bag in unvocalized writing, but in this sentence the most natural reading is in the bag, especially because of the definite-style contraction pattern

If Hebrew wants to be completely clear in vocalized text, the vowels would show the difference. But in everyday unvocalized Hebrew, context usually tells you.

In a sentence like this, learners are usually expected to understand בתיק as in the bag.

Yes, it is normal.

Hebrew says:

אני בטוח שהמפתח שלך בתיק.

Literally:

I am sure that your key in the bag.

English requires is, but Hebrew does not in the present tense, so the Hebrew word order is perfectly natural.

The sentence is built like this:

• אני בטוח = main statement: I’m sure
• שהמפתח שלך בתיק = subordinate clause: that your key is in the bag

So even though it may feel unusual to an English speaker, the structure is standard Hebrew.

מפתח is pronounced approximately maf-TE-ach.

A few helpful notes:

• the stress is usually on the last syllable: maf-te-ACH
• the final sound ח is a guttural sound, like the ch in German Bach or Scottish loch
• it is not pronounced like English k or h

So try something like:

maf-te'akh

If you cannot produce ח perfectly yet, that is very normal for beginners.

Not always. תיק can mean several related things, depending on context:

• bag
• purse
• briefcase
• backpack in some contexts, though תרמיל or תיק גב can be more specific
• case, like a case for carrying things

So בתיק could mean:

• in the bag
• in the case
• in your purse
• in the briefcase

The exact English translation depends on the situation.

You could, but it is usually less natural here.

Hebrew normally does not use הוא as a present-tense is in a simple sentence like this. So the more natural version is:

אני בטוח שהמפתח שלך בתיק.

Using הוא can sound marked, emphatic, or unnatural unless there is a specific reason for it.

So for a basic statement of location, stick with:

המפתח שלך בתיק = your key is in the bag

מפתח is masculine.

That matters when adjectives or numbers refer to it. For example:

• מפתח חדש = a new key
• שני מפתחות = two keys

In this sentence, however, the adjective בטוח does not describe מפתח. It describes אני — the speaker.

So:

• אני בטוח = masculine speaker
• אני בטוחה = feminine speaker

The gender of מפתח does not affect בטוח here.

Yes. שלך can mean:

• your when speaking to one male
• your when speaking to one female

So in this sentence, המפתח שלך can mean your key whether the listener is male or female.

If you want to distinguish number:

• שלך = your, singular
• שלכם = your, plural masculine / mixed
• שלכן = your, plural feminine

So שלך is singular, but not specific to the listener’s gender in this form.