אני רוצה להדגיש את המילים החדשות במחברת.

Sometimes yes, but אני is very natural here.

In this sentence, רוצה is a present-tense form, and present-tense forms in Hebrew do not clearly show person the way past and future forms often do. So אני רוצה is the normal clear way to say I want.

Without אני, the listener would have to guess who wants to do the action from context.

Yes. The spelling is usually the same, but the pronunciation changes:

• male speaker: אני רוצה = ani rotse
• female speaker: אני רוצה = ani rotsa

A full pronunciation of the sentence would be roughly:

• male: ani rotse lehadgish et hamilim hachadashot bamachberet
• female: ani rotsa lehadgish et hamilim hachadashot bamachberet

Because after רוצה, Hebrew normally uses the infinitive of the next verb.

So:

• רוצה = want
• להדגיש = to highlight / to emphasize

This is the same basic pattern as in English:

• I want to highlight
• אני רוצה להדגיש

The ל־ at the beginning of להדגיש is the usual marker of the infinitive, like to in English.

להדגיש can mean to emphasize, to stress, or to highlight, depending on context.

In this sentence, because it talks about the new words and the notebook, the most natural meaning is probably to highlight or to mark for emphasis in writing.

So the verb is broader than just using a highlighter pen, but that is one possible use.

Here, את is the definite direct object marker. It does not have a direct English translation.

Hebrew uses את before a direct object when that object is definite, for example when it has the on it.

Here the direct object is:

• המילים החדשות = the new words

Because that object is definite, Hebrew puts את before it:

• להדגיש את המילים החדשות

So את is not the word you here. It is just a grammatical marker.

Because in Hebrew, adjectives usually come after the noun, not before it.

So Hebrew says:

• המילים החדשות
• literally: the words the-new
• natural English: the new words

This noun-then-adjective order is very normal in Hebrew.

Because in Hebrew, if the noun is definite, the adjective must also be definite.

So:

• מילים חדשות = new words
• המילים החדשות = the new words

English only uses the once, but Hebrew marks definiteness on both the noun and its adjective.

Because Hebrew adjectives must agree with the noun in gender and number.

Here:

• מילה = word (feminine singular)
• מילים = words (feminine plural)

So the adjective also has to be feminine plural:

• חדשה = feminine singular
• חדשות = feminine plural

That is why Hebrew says:

• מילים חדשות
• not מילים חדשים

במחברת is made of:

• ב־ = in
• המחברת = the notebook

Together, they become במחברת, meaning in the notebook.

In Hebrew, short prepositions like ב־, ל־, and כ־ are usually attached directly to the following word, so they are written as one word.

Also, when ב־ combines with ה־, the result is commonly pronounced like ba-, so במחברת is pronounced roughly bamachberet.

The given order is very natural:

• אני רוצה להדגיש את המילים החדשות במחברת

A location phrase like במחברת often comes near the end, after the object.

Hebrew word order is somewhat flexible, so other arrangements are possible for emphasis, but this version is the most neutral and straightforward for a learner to use.