ביומן שלי כתוב שאני אמורה לסיים 2 משימות לפני 3.

It can mean any of those depending on context.

In this sentence, because it talks about tasks and a time deadline, יומן probably sounds more like planner, schedule book, or calendar/planner entry than a personal diary.

So ביומן שלי could be understood as in my planner or in my diary, depending on how the meaning was presented.

It literally means in my diary / in my planner.

Breakdown:

• ב־ = in
• יומן = diary / planner
• שלי = my

In Hebrew, short prepositions like ב־ are usually attached directly to the following word, so:

• ב + יומן → ביומן

That attachment is completely normal.

Hebrew usually leaves out the present-tense verb to be.

So:

• כתוב = written / is written
• אני אמורה = I supposed in a literal word-for-word sense, but naturally I am supposed

English needs is/am, but Hebrew usually does not in the present tense.

For example:

• אני אמורה לסיים = I am supposed to finish
• ביומן שלי כתוב = It is written in my diary / My diary says

כתוב literally means written.

In sentences like this, Hebrew often uses כתוב ש... to mean something like:

• it says that...
• it is written that...

So ביומן שלי כתוב שאני אמורה... is very natural Hebrew for:

• In my diary/planner it says that I’m supposed to...

It is not talking about the diary itself being physically written; it means the diary contains that information.

Because it is not agreeing with יומן.

A learner might think:

• יומן is masculine singular
• so maybe כתוב is describing יומן

But that is not really what is happening.

The structure is more like:

• In my diary, [it] is written that...

So ביומן שלי is just a prepositional phrase: in my diary.

The sentence has an implied, nonspecific subject like it, and Hebrew commonly uses masculine singular as the default in this kind of expression. That is why כתוב appears in masculine singular form.

שאני is made of:

• ש־ = that
• אני = I

So שאני means that I.

In Hebrew, ש־ is a very common prefix that attaches directly to the next word, so:

• ש + אני → שאני

That is completely normal spelling.

Because the speaker is feminine.

אמור / אמורה agrees with the person being described:

• אני אמור = I am supposed to (said by a male speaker)
• אני אמורה = I am supposed to (said by a female speaker)

So this sentence tells you that the speaker is female.

If a man said it, it would be:

• ביומן שלי כתוב שאני אמור לסיים...

This is a very common pattern in Hebrew:

• אמור/אמורה + infinitive

It means:

• supposed to + verb

So:

• אמורה לסיים = supposed to finish

Here:

• אמורה = supposed
• לסיים = to finish

Why לסיים? Because after אמור/אמורה, Hebrew normally uses the infinitive form of the next verb.

Yes. If you write the number out in words, you would normally say:

• שתי משימות

because משימה is a feminine noun.

When Hebrew uses digits, like 2, the gender is not visible in the writing. But when reading it aloud, you would usually still say:

• שתי משימות

So:

• 2 משימות
• שתי משימות

mean the same thing here.

Because את is usually used before a definite direct object, not an indefinite one.

Here, 2 משימות is indefinite:

• two tasks

So you do not use את.

Compare:

• אני צריכה לסיים 2 משימות = I need to finish two tasks
• אני צריכה לסיים את שתי המשימות = I need to finish the two tasks

In the second sentence, the object is definite (the two tasks), so את appears.

Literally, it means before 3.

In this kind of scheduling context, it usually means:

• before 3 o’clock

Hebrew often leaves out words like o’clock when the meaning is obvious from context.

So לפני 3 is a natural shorthand for:

• לפני שלוש
• or more explicitly, לפני השעה שלוש

If you read the digit aloud here, you would say:

• לפני שלוש = lifnei shalosh

Yes, it is natural.

Starting with ביומן שלי puts the source of the information first:

• In my diary/planner, it says...

This is similar to English when we begin with:

• In my calendar, it says...

Hebrew could also rearrange it, for example:

• כתוב ביומן שלי שאני אמורה לסיים 2 משימות לפני 3

That also works, but the original sentence sounds very natural and emphasizes where the information is written.

A natural pronunciation would be:

Beyoman sheli katuv she'ani amura lesayem shtei mesimot lifnei shalosh.

A few notes:

• שאני is pronounced roughly she'ani
• 2 משימות would normally be read aloud as shtei mesimot
• 3 here would normally be read as shalosh