בתערוכה ראינו ציור גדול של אמנית חדשה, וכל מה שהיא אמרה עליו היה מעניין מאוד.

בתערוכה is made from the preposition ב־ meaning in / at plus תערוכה meaning exhibition.

In Hebrew, prepositions like ב־ often attach directly to the noun. If the noun is definite, the ה־ of the is usually absorbed into the preposition.

So:

• בתערוכה can mean at the exhibition
• In unpointed Hebrew, it can also sometimes be read as in an exhibition, and context tells you which is meant

That is why you do not see a separate word for the.

Because Hebrew verbs usually already show who did the action.

ראינו means we saw:

• ראי־ = the root idea of seeing
• ־נו = we

So אנחנו is optional. You can add it for emphasis, but it is not necessary.

• ראינו = we saw
• אנחנו ראינו = we saw, with extra emphasis on we

In Hebrew, adjectives normally come after the noun.

So:

• ציור גדול = a big painting
• אמנית חדשה = a new female artist

This is the normal order in Hebrew, unlike English.

Also, the adjective must agree with the noun in:

• gender
• number
• definiteness

So:

• ציור is masculine singular, so גדול is masculine singular
• אמנית is feminine singular, so חדשה is feminine singular

של is a very common way to show possession or connection in Hebrew. Here it means something like of or belonging to.

So:

• ציור של אמנית חדשה = a painting of a new artist / a painting by a new artist

In modern Hebrew, של is extremely common and often replaces older construct-style forms that English speakers might learn later.

אמנית means female artist.

The masculine form is:

• אמן = male artist

The feminine ending ־ית is common in some Hebrew nouns.

So here, because the artist is female, the sentence uses:

• אמנית חדשה = a new female artist

That is also why later the sentence says היא אמרה = she said.

It helps to break it into parts:

• ו־ = and
• כל = all / every
• מה = what / that which
• שהיא אמרה עליו = that she said about it

So the whole phrase means:

• וכל מה שהיא אמרה עליו = and everything she said about it
• more literally: and all that she said about it

This is a very common Hebrew pattern:

• כל מה ש... = everything that... / all that...

For example:

• כל מה שאני יודע = everything I know
• כל מה שהיא רצתה = everything she wanted

עליו means about it or about him, depending on context.

It is made from:

• על = on / about
• ־יו = him / it (masculine singular object suffix)

Here it refers back to ציור because ציור is a masculine singular noun.

So:

• היא אמרה עליו = she said about it
• in natural English: she said about the painting

Because the subject is feminine singular: the artist.

• היא = she
• אמרה = said in the feminine singular past form

Compare:

• הוא אמר = he said
• היא אמרה = she said

Hebrew past-tense verbs agree with the subject in gender and number.

This is a very common question.

The subject of היה מעניין מאוד is not אמנית. It is the whole phrase:

• כל מה שהיא אמרה עליו = everything she said about it

This kind of subject is usually treated as singular, and Hebrew normally uses the masculine singular form as the default here:

• היה = was
• מעניין = interesting

So:

• כל מה שהיא אמרה עליו היה מעניין מאוד = Everything she said about it was very interesting

Even though she is feminine, the thing that was interesting is everything she said, not the artist herself.

Because it agrees with the grammatical subject, which is:

• כל מה שהיא אמרה עליו

Hebrew often uses masculine singular as the default form for ideas like:

• everything
• what she said
• clauses acting as a subject

So מעניין is the expected form here.

If the subject were a feminine singular noun, you would expect:

• מעניינת

But that is not what is happening in this sentence.

מאוד means very.

In Hebrew, מאוד usually comes after the adjective or adverb it modifies.

So:

• מעניין מאוד = very interesting
• literally: interesting very

This is normal Hebrew word order.

More examples:

• גדול מאוד = very big
• יפה מאוד = very beautiful

Hebrew is flexible with word order, and putting בתערוכה first sets the scene:

• בתערוכה ראינו... = At the exhibition, we saw...

This is similar to English when you begin with a place expression for context.

You could also say:

• ראינו בתערוכה ציור גדול...

But the given order sounds natural and helps establish where the event happened right away.