יש דבר אחד שאני לא מבינה.

יש means there is or there are.

So the sentence begins with an existence structure:

• יש דבר אחד... = There is one thing...

A useful point: יש does not change for singular vs. plural.

• יש דבר = there is a thing
• יש דברים = there are things

It is not exactly a normal present-tense verb like English is. It is the standard Hebrew way to express existence.

With one, Hebrew usually puts the noun first and אחד / אחת after it.

So:

• דבר אחד = one thing
• ילד אחד = one boy
• בעיה אחת = one problem

This is normal Hebrew word order. For an English speaker, it can feel reversed at first, because English puts one before the noun.

Because דבר is a masculine noun, and the number one has to agree with the noun's gender.

• masculine: אחד
• feminine: אחת

So:

• דבר אחד = one thing
• שאלה אחת = one question

Even though thing is not gendered in English, Hebrew nouns still have grammatical gender.

שאני is made of two parts:

• ש־ = that / which
• אני = I

Together, שאני means that I.

So:

• דבר אחד שאני לא מבינה = one thing that I don't understand

In writing, ש־ is commonly attached directly to the next word, so you get שאני as one written unit.

Because Hebrew normally puts לא directly before the verb or expression being negated.

• אני מבינה = I understand
• אני לא מבינה = I do not understand

So לא works like the regular word for not in standard Hebrew.

מבינה is the feminine singular present-tense form of להבין (to understand).

So:

• אני מבינה = I understand / I am understanding — said by a woman
• אני מבין = I understand / I am understanding — said by a man

Hebrew present-tense forms agree with the subject in gender and number, so the speaker's gender matters here.

Historically, Hebrew present-tense forms are related to participles, so learners often notice that they look a bit like understanding.

But in normal modern Hebrew, מבינה here simply functions as the ordinary present tense:

• אני מבינה = I understand

So for practical purposes, you should read it as regular present tense English.

Here, אני is important.

Hebrew present-tense verb forms show gender and number, but not person as clearly as English does. Without אני, the clause could become unclear.

• שאני לא מבינה = that I do not understand

If you removed אני, שלא מבינה would not clearly mean that I don't understand. It could sound like that does not understand, referring to some feminine singular noun.

So in this sentence, keeping אני is the natural choice.

Because דבר אחד means one thing, which is indefinite.

• דבר אחד = one thing
• הדבר = the thing

Hebrew uses ה־ for the, but this sentence is not talking about the thing in a definite sense. It is introducing one thing.

A common transliteration is:

yesh davar echad she'ani lo meviná

Rough pronunciation notes:

• יש = yesh
• דבר = da-VAR
• אחד = e-KHAD
  
  • the ח is a throaty sound, often approximated as kh
• שאני = she-a-NI
• לא = lo
• מבינה = me-vi-NA

So the rhythm is roughly:

yesh da-VAR e-KHAD she-a-NI lo me-vi-NA