בבוקר אני מכינה כריך עם חמאה וגבינה.

Because it is really two parts joined together:

• ב־ = in / at
• הבוקר = the morning

When ב־ joins a word with ה־, Hebrew usually absorbs the ה. So:

• ב + הבוקר → בבוקר

So בבוקר means in the morning, and the double ב reflects that combination.

It usually means in the morning.

Hebrew often uses the definite form for parts of the day in expressions like this:

• בבוקר = in the morning
• בערב = in the evening
• בלילה = at night

In natural English translation, in the morning is the best match.

Because מכינה is feminine singular.

In Hebrew present tense, the verb agrees with the gender and number of the subject. Since the speaker is אני and the form is מכינה, this tells you the speaker is female.

• אני מכינה = I (female) prepare/make
• אני מכין = I (male) prepare/make

So if a man said the same sentence, he would say:

בבוקר אני מכין כריך עם חמאה וגבינה.

Yes. In modern Hebrew, the present tense is built from forms that historically come from participles.

So מכינה functions as prepare / am preparing / make / am making, depending on context.

In this sentence, it can naturally mean something like:

• I make
• I prepare
• I am making

Hebrew present tense does not distinguish those English shades as clearly as English does.

The dictionary form is להכין, which means to prepare or to make ready.

This verb changes in the present tense like this:

• מכין = masculine singular
• מכינה = feminine singular
• מכינים = masculine plural
• מכינות = feminine plural

So מכינה is the feminine singular present form of להכין.

Sometimes Hebrew can omit subject pronouns, but here אני is very useful.

The form מכינה tells you:

• singular
• feminine

But it does not tell you person clearly by itself in present tense. מכינה could mean:

• I prepare
  or
• she prepares

depending on context.

So adding אני makes the meaning clear: I.

Because Hebrew has no separate indefinite article like English a / an.

So:

• כריך can mean a sandwich
• הכריך means the sandwich

The noun by itself is often indefinite, and context tells you how to translate it.

Because the sentence is talking about a sandwich, not the sandwich.

In Hebrew, ה־ marks definiteness:

• כריך = a sandwich
• הכריך = the sandwich

So the sentence uses the indefinite form because it is introducing the sandwich as a general one, not a specific already-known sandwich.

For the same reason: they are being used in an indefinite, general way.

• עם חמאה וגבינה = with butter and cheese

This sounds natural when talking about ingredients in general. If you meant specific butter and specific cheese already known in the conversation, you might say:

• עם החמאה והגבינה

But in ordinary statements about what someone makes, the indefinite form is normal.

עם means with.

So:

• כריך עם חמאה וגבינה = a sandwich with butter and cheese

Be careful not to confuse:

• עם = with
• ו־ = and

So in this sentence:

• עם connects the sandwich to its ingredients
• ו connects butter and cheese

Hebrew word order is more flexible than English word order.

Starting with בבוקר puts the time expression first:

• בבוקר אני מכינה כריך עם חמאה וגבינה.

This is very natural and means something like:

• In the morning, I make a sandwich with butter and cheese.

You could also say:

• אני מכינה בבוקר כריך עם חמאה וגבינה.

But the original sentence sounds smooth and natural, especially when the speaker wants to set the time first.

Here the ו־ is pronounced ve-, so:

• וגבינה = ve-gvina

In this sentence, you would pronounce the last part as:

• khem'ah ve-gvina

So the whole sentence is approximately:

ba-BO-ker a-NI me-khi-NA ka-RIKH im khem-AH ve-gvi-NA

A natural transliteration is:

Baboker ani mekhina karikh im khem'ah ve-gvina.

A few pronunciation notes:

• בבוקר = baboker
• מכינה = mekhina
• כריך = karikh
• עם = im
• חמאה = khem'ah
• וגבינה = ve-gvina

The stress is usually near the end of each word, especially in:

• מכינה
• חמאה
• גבינה