היה דיאלוג קצר בין האמא לבת, והוא היה החלק הכי יפה בסרט.

At the start of a sentence, היה often means there was or there existed in the past.

So היה דיאלוג קצר... means there was a short dialogue..., not he was a short dialogue.

This is a common past-tense pattern in Hebrew. In the present tense, Hebrew would usually use יש instead: יש דיאלוג קצר = there is a short dialogue.

In Hebrew, adjectives normally come after the noun they describe.

So:

• דיאלוג קצר = a short dialogue
• סרט יפה = a beautiful movie

Hebrew word order here is different from English, where adjectives usually come before the noun.

Because דיאלוג is a masculine singular noun, the adjective has to match it.

So:

• דיאלוג קצר = masculine singular
• שיחה קצרה = feminine singular

Hebrew adjectives agree with the noun in gender and number.

You can tell from the words that agree with it:

• היה is masculine singular
• קצר is masculine singular
• הוא is masculine singular

So even if you did not already know the gender of דיאלוג, the agreement in the sentence shows it.

בין means between, and Hebrew often uses the pattern בין X ל-Y for between X and Y.

So בין האמא לבת means between the mother and the daughter.

The ל־ before the second noun is normal in this structure. Here it does not really mean to; it is just part of the between X and Y pattern.

Because in Hebrew, the preposition ל־ can combine with the definite article ה־.

So ל + הבת becomes לבת in normal unpointed spelling.

This is similar to:

• ב + הסרט becoming בסרט

In unpointed Hebrew, you often do not see the article separately after prepositions like ב־, ל־, and כ־.

והוא refers back to הדיאלוג.

In English we would say and it was, but Hebrew uses the regular gendered pronouns for things as well as people. Since דיאלוג is masculine, Hebrew uses הוא.

So here הוא means it, even though the literal form is the same as he.

Because in the past tense, Hebrew normally does use a form of to be.

In the present tense, Hebrew often leaves to be out:

• הוא החלק הכי יפה בסרט = it is the best part of the movie

But in the past tense, you need היה:

• הוא היה החלק הכי יפה בסרט = it was the best part of the movie

הכי makes the adjective superlative: most or -est.

So:

• יפה = beautiful / nice
• הכי יפה = most beautiful / nicest / best

This is the most common everyday way to form the superlative in modern Hebrew.

Literally, יפה means beautiful or pretty, but in real Hebrew it is often used more broadly for nice, good, lovely, or best in context.

So החלק הכי יפה בסרט can sound very natural even if the best English translation is the best part of the movie, not just the most beautiful part.

Because the preposition ב־ combines with the definite article ה־.

So:

• ב + הסרט becomes בסרט

This is very common in Hebrew:

• בבית = in the house
• לילד = to the boy
• כמלך = as the king

The article is still there in meaning, but it is absorbed into the preposition in spelling.

Both relate to mother, but they differ in style.

• אמא is more everyday and conversational
• אם is more formal or literary

So האמא sounds natural in ordinary modern Hebrew, especially in a sentence describing characters in a movie.