אני רוצה לצפות בסדרה חדשה הערב.

In normal unpointed Hebrew, רוצה can be read two ways:

• rotze — if the speaker is male
• rotza — if the speaker is female

So אני רוצה can mean I want for either gender. The spelling stays the same; the pronunciation changes.

The prefix ל־ is the normal way Hebrew forms the infinitive, so it often corresponds to English to.

• לצפות = to watch

After a verb like רוצה (want), Hebrew uses the infinitive:

• אני רוצה לצפות = I want to watch

Both verbs can relate to seeing, but they are not exactly the same:

• לראות = to see
• לצפות ב־ = to watch

When talking about watching TV, a movie, or a series, לצפות ב־ is a very natural choice.
So לצפות בסדרה is more like to watch a series, not just to see one.

Yes, ב־ often means in / at / on, but some Hebrew verbs require a preposition that English does not.

The verb לצפות usually takes ב־ before the thing being watched:

• לצפות בסרט = to watch a movie
• לצפות בסדרה = to watch a series

So here ב־ is required by the verb. It is not being translated literally as in.

Because את is used for a definite direct object, and that is not what we have here.

In this sentence:

• the noun comes after the preposition ב־
• the phrase is also indefinite: סדרה חדשה = a new series

So את would not be used.

In Hebrew, adjectives usually come after the noun.

Also, adjectives must agree with the noun in:

• gender
• number
• definiteness

Here:

• סדרה is feminine singular
• so the adjective must also be feminine singular
• therefore: חדשה and not חדש

So:

• סדרה חדשה = a new series

Because if the phrase were definite, both the noun and the adjective would normally be marked as definite:

• הסדרה החדשה = the new series

Here we have:

• בסדרה חדשה

The adjective חדשה has no ה־, so the phrase is understood as indefinite: a new series.

In time expressions, Hebrew often uses the definite article ה־ where English does not.

So:

• הערב can literally be the evening
• but in context it very often means this evening / tonight

That is why אני רוצה לצפות בסדרה חדשה הערב sounds natural as I want to watch a new series tonight.

The given order is very natural:

• אני רוצה לצפות בסדרה חדשה הערב

But Hebrew word order is flexible, especially with time expressions. For example, you could also say:

• הערב אני רוצה לצפות בסדרה חדשה

Both are correct. The original version is just a neutral, everyday word order.