היא בודקת את היומן בכל בוקר, כי בלי יומן היא שוכחת איזו משימה חשובה יותר.

את marks a definite direct object. It does not have its own English translation here.

• היומן = the diary / the planner
• Because it is definite, Hebrew adds את before it.

So:

• היא בודקת את היומן = She checks the diary/planner.
• היא בודקת יומן would mean something more like She checks a diary / diary entries, and it sounds less specific.

Both verbs are in the present tense, feminine singular form, because the subject is היא = she.

• בודקת = checking / checks, feminine singular
• שוכחת = forgetting / forgets, feminine singular

If the subject were masculine singular, you would get:

• הוא בודק
• הוא שוכח

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

Yes, Hebrew often repeats the subject in a new clause, especially when it helps clarity.

So:

• היא בודקת את היומן בכל בוקר, כי בלי יומן היא שוכחת...

is very natural.

You might hear a shorter version in conversation if the subject is obvious, but repeating היא is normal and clear. Since present-tense Hebrew verbs do not fully show person the way past/future verbs do, keeping היא can be especially helpful.

Literally, בכל בוקר is:

• ב־ = in / on
• כל = every / each
• בוקר = morning

So word-for-word it is something like in every morning, but natural English is every morning.

This is a very common Hebrew pattern:

• בכל יום = every day
• בכל שבוע = every week
• בכל פעם = every time

Because the sentence is speaking generally, not about one specific diary/planner.

• בלי יומן = without a diary / without a planner
• בלי היומן = without the diary / without the planner

Here the idea is: if she does not have a diary/planner at all, she forgets. So the indefinite form יומן makes sense.

יומן can mean several related things, depending on context:

• diary
• journal
• planner
• appointment book
• schedule book

In this sentence, because it talks about forgetting which task is more important, planner or schedule book is probably the best fit in English. A native Hebrew speaker would understand יומן from context.

Because משימה is a feminine singular noun, and standard Hebrew uses the feminine form איזו with feminine singular nouns.

• איזה = masculine singular
• איזו = feminine singular
• אילו = plural

So:

• איזו משימה = which task

In everyday spoken Hebrew, many speakers use איזה very broadly, even where standard grammar would prefer איזו. But in careful or standard Hebrew, איזו משימה is the expected form.

Here איזו introduces an embedded question.

The sentence is not asking the listener a question. Instead, it says that she forgets which task is more important.

So:

• איזו משימה חשובה יותר = which task is more important

This is similar to English in sentences like:

• She forgot which book she wanted.
• I don’t know which bus to take.

Because משימה is a feminine noun, so the adjective must also be feminine.

• חשוב = important, masculine singular
• חשובה = important, feminine singular

So:

• משימה חשובה = an important task

Hebrew adjectives normally agree with the noun in gender and number.

Hebrew usually forms the comparative with יותר = more.

So:

• חשובה = important
• חשובה יותר = more important

Because משימה is feminine singular, the adjective stays feminine singular:

• משימה חשובה יותר = a more important task

This is the same basic idea as:

• גדול יותר = bigger
• מהיר יותר = faster

Yes. Both word orders can be heard, and both are understandable.

• משימה חשובה יותר
• משימה יותר חשובה

The version in your sentence, משימה חשובה יותר, is very natural. Hebrew is somewhat flexible here, though certain combinations may sound more natural than others depending on style and emphasis.

Because the comparison is left implicit.

In English, we can also say:

• She forgets which task is more important

without saying than what. Hebrew works the same way here.

If you wanted to make the comparison explicit, Hebrew could add it, for example:

• חשובה יותר ממשימה אחרת = more important than another task

But in your sentence, the idea is simply that she forgets the relative importance among the tasks.

Because יותר means more, while הכי means most.

• חשובה יותר = more important
• הכי חשובה = the most important

So the sentence as written means she forgets which task is more important. If you wanted which task is the most important, Hebrew would more likely say:

• איזו משימה הכי חשובה
• or, in more formal Hebrew, מהי המשימה החשובה ביותר

Both are correct, but they mean most important, not just more important.