אני תמיד מפעילה כתוביות בעברית כשאני צופה בסדרה חדשה.

מפעילה is the feminine singular present-tense form. That tells you the speaker is female.

• אני מפעיל = I turn on / activate ... (male speaker)
• אני מפעילה = I turn on / activate ... (female speaker)

In Hebrew present tense, verbs often show gender even with אני.

Here מפעילה means turn on, switch on, or activate.

The verb is from להפעיל, which is often used for making something function or start operating:

• להפעיל מזגן = to turn on an air conditioner
• להפעיל תוכנה = to run software
• להפעיל כתוביות = to turn on subtitles

So in this sentence, it is very natural to understand מפעילה כתוביות as I turn on subtitles.

Hebrew normally uses כתוביות (subtitles) in the plural, just like English usually says subtitles rather than subtitle.

The singular is:

• כתובית = a subtitle

But when talking about the subtitle feature in general, Hebrew usually says:

• כתוביות = subtitles

So מפעילה כתוביות is the normal way to say turn on subtitles.

The prefix ב־ means in.

So:

• עברית = Hebrew
• בעברית = in Hebrew

Here כתוביות בעברית means subtitles in Hebrew.

This use of ב־ is very common with languages:

• ספרדית = Spanish
• בספרדית = in Spanish
• אנגלית = English
• באנגלית = in English

כשאני is כש־ + אני.

• כש־ = when
• אני = I

Together, כשאני means when I.

This is very common in Hebrew: short connecting words attach directly to the next word.

For example:

• כשאני באה = when I come
• כשאני צופה = when I watch

You may also see the longer form כאשר אני, but כשאני is more everyday and natural in speech.

לצפות is often the natural verb for watching TV, films, or video content.

• לצפות בסדרה = to watch a series
• לצפות בטלוויזיה = to watch TV

By contrast, לראות means to see, and can also sometimes mean to watch, but לצפות ב־ is especially common for intentional viewing of shows or videos.

So אני צופה בסדרה sounds very natural for I’m watching a series.

The verb לצפות usually takes the preposition ב־.

So:

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

This is just something the verb requires. A learner often has to memorize that לצפות goes with ב־.

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

So:

• סדרה חדשה = a new series
• ספר מעניין = an interesting book
• מכונית גדולה = a big car

This is the normal Hebrew word order for noun + adjective.

Because סדרה is a feminine singular noun, the adjective has to match it.

• סדרה = feminine singular
• חדשה = feminine singular form of new

Compare:

• ספר חדש = a new book
• סדרה חדשה = a new series
• סרט חדש = a new movie

Hebrew adjectives agree with nouns in gender and number.

Without vowel marks, בסדרה can represent either:

• בְּסדרה = in a series
• בַּסדרה = in the series

In normal unpointed Hebrew, these look the same.

In this sentence, we know it means in a new series / really when I watch a new series, not the new series, because the adjective is חדשה and not החדשה.

If it were definite, you would expect:

• בסדרה החדשה = in the new series

So the adjective helps you tell that the phrase is indefinite here.

תמיד means always, and it often comes before the main verb in Hebrew:

• אני תמיד לומד = I always study
• אני תמיד מפעילה = I always turn on

That said, Hebrew word order is fairly flexible, so other placements are possible depending on emphasis. But אני תמיד מפעילה... is very natural and standard.

In this form, צופה looks the same for masculine singular and feminine singular.

So:

• אני צופה can be said by a man
• אני צופה can also be said by a woman

The speaker’s gender is shown clearly earlier by מפעילה, not by צופה.

It is built in two parts:

1. אני תמיד מפעילה כתוביות בעברית
   = I always turn on Hebrew subtitles

2. כשאני צופה בסדרה חדשה
   = when I watch a new series

So the whole sentence is:

• main clause + when clause

This is a very common Hebrew pattern:

• אני שותה קפה כשאני עובדת = I drink coffee when I work
• אני מפעילה כתוביות כשאני צופה... = I turn on subtitles when I watch...