מברשת השיניים שלי לא בחדר; אולי היא במקלחת.

In present-tense Hebrew, the verb to be is usually omitted.

So:

• מברשת השיניים שלי לא בחדר = My toothbrush is not in the room
• אולי היא במקלחת = Maybe it is in the shower/bathroom

Hebrew often just puts the subject next to the description or location. If you want past or future, then forms of להיות (to be) are used.

For example:

• היא הייתה בחדר = She/it was in the room
• היא תהיה במקלחת = She/it will be in the shower/bathroom

Hebrew often builds compound nouns with a structure called the construct state.

So מברשת השיניים literally means brush of the teeth, which is how Hebrew expresses toothbrush.

Breakdown:

• מברשת = brush of...
• השיניים = the teeth

A very common dictionary-style form is מברשת שיניים = a toothbrush / toothbrush.
Here, because the speaker is referring to a specific toothbrush, the phrase appears as מברשת השיניים שלי = my toothbrush.

In Modern Hebrew, possessive words like שלי (mine / my) usually come after the noun.

Examples:

• הספר שלי = my book
• החדר שלי = my room
• מברשת השיניים שלי = my toothbrush

With a construct phrase like מברשת השיניים, the possessive comes after the whole phrase, not after the first word only.

So Hebrew says, literally, something like:

• the toothbrush of mine

not:

• my the-toothbrush

That is how definiteness works in a construct phrase.

In Hebrew construct chains, the first noun usually does not take ה־, even when the whole phrase is definite. The definiteness is shown on the second noun.

So:

• מברשת שיניים = a toothbrush / toothbrush
• מברשת השיניים = the toothbrush

Even though only השיניים visibly has ה־, the entire phrase becomes definite.

Because the preposition ב־ (in) combines with ה־ (the).

So:

• ב + החדר becomes בחדר
• ב + המקלחת becomes במקלחת

In fully pointed Hebrew, the pronunciation shows the difference more clearly:

• בַּחֶדֶר = in the room
• בְּחֶדֶר = in a room

But in normal unpointed writing, both are spelled בחדר. Context tells you which meaning is intended.

The same thing happens with במקלחת.

Because מברשת is a feminine singular noun in Hebrew.

Hebrew nouns have grammatical gender, and pronouns must match that gender, even for objects.

So:

• מברשת = feminine
• therefore היא = she / it

In English we use it for objects, but Hebrew still uses the masculine or feminine form required by the noun.

If the noun were masculine, Hebrew would use הוא.

Because the sentence is negating the toothbrush’s location, not its existence.

• היא לא בחדר = It is not in the room
• אין מברשת שיניים בחדר = There is no toothbrush in the room

So:

• לא negates a clause or predicate: not
• אין means there is not / there is no

Here the toothbrush exists; the speaker is just saying it is not in that place, so לא is the correct choice.

אולי means maybe or perhaps.

It often appears at the beginning of the clause:

• אולי היא במקלחת = Maybe it’s in the shower/bathroom

That is the most natural neutral placement here.

You may also hear other word orders, such as:

• היא אולי במקלחת

That can sound slightly different in emphasis, but the basic meaning stays the same.

Literally, מקלחת is shower.

Depending on context, it can refer to:

• the shower itself
• the shower area
• sometimes, more loosely, the bathroom where the shower is

So in a sentence like this, the intended English translation may be in the shower or in the bathroom, depending on the context already provided.

In casual speech, if the subject is very clear, Hebrew can sometimes omit it. But אולי היא במקלחת is the clearer and more complete version.

Because there is no present-tense verb here, the pronoun helps show what the sentence is about.

So:

• אולי היא במקלחת = clear and standard
• אולי במקלחת = possible in context, but more elliptical

Using היא is especially helpful for learners because it makes the sentence structure easier to follow.