Je garde ce document jusqu’à demain matin.

Here, garde means keep.

The verb is garder, which can mean several related things depending on context:

• to keep
• to hold on to
• to look after
• to guard

In Je garde ce document jusqu’à demain matin, the natural meaning is I’m keeping this document until tomorrow morning.

So this is not really about physically guarding the document like a security guard. It is more about having it in your possession until a certain time.

French normally requires a subject pronoun, so you usually need je for I.

• Je garde = I keep / I am keeping

In English, the subject is also required: I keep.
French works similarly here.

You may sometimes hear just Garde... in commands, but that means Keep...! and is the imperative, not a normal statement.

So:

• Je garde ce document = I’m keeping this document
• Garde ce document = Keep this document

Because document is a masculine singular noun that begins with a consonant.

French uses different forms of this:

• ce for masculine singular before most consonants
• cet for masculine singular before a vowel or silent h
• cette for feminine singular

So:

• ce document = this document
• cet email = this email
• cet homme = this man
• cette lettre = this letter

Since document is masculine and starts with d, the correct form is ce.

Yes, document is masculine: un document.

In this sentence, you can tell because of ce:

• ce document shows that the noun is masculine singular

French nouns have grammatical gender, and that affects articles and demonstratives:

• un document
• le document
• ce document

There is not always a reliable way to guess gender just from meaning, so it often has to be learned with the noun.

Jusqu’à means until or up to.

It is made from:

• jusque
  • à → jusqu’à

The apostrophe appears because jusque drops its final e before à. This is a normal spelling contraction in French.

So:

• jusqu’à demain = until tomorrow
• jusqu’à midi = until noon
• jusqu’à Paris = as far as Paris

In your sentence:

• jusqu’à demain matin = until tomorrow morning

Because demain matin is a fixed time expression meaning tomorrow morning, and French normally does not use an article there.

So:

• demain = tomorrow
• demain matin = tomorrow morning
• demain soir = tomorrow evening

This is similar to English, which also says tomorrow morning, not the tomorrow morning.

Compare:

• ce matin = this morning
• demain matin = tomorrow morning
• hier matin = yesterday morning

These expressions usually appear without le/la/un.

Because the action starts now and continues until tomorrow morning.

French often uses the present tense for something that is true at the moment of speaking, even if the sentence includes a future endpoint.

So Je garde ce document jusqu’à demain matin means something like:

• I’m keeping this document until tomorrow morning

The focus is on a present situation that lasts up to a later time.

English does something similar:

• I’m here until Friday
• I’m keeping it until tomorrow

You do not need a future tense in French just because demain matin is mentioned.

Yes. That is also correct, but it is slightly different in feel.

• Je garde ce document jusqu’à demain matin
  = I’m keeping this document until tomorrow morning

• Je vais garder ce document jusqu’à demain matin
  = I’m going to keep this document until tomorrow morning

The first one often sounds more like a current arrangement or fact.
The second one can sound a bit more like a decision or future plan.

In many everyday situations, both are possible.

No. Demain matin means tomorrow morning only.

• demain = tomorrow
• matin = morning

So together:

• demain matin = tomorrow morning

If you wanted the morning after tomorrow, you would need a different expression, such as:

• après-demain matin = the morning after tomorrow

So in your sentence, the document will be kept only until the next morning after today.

Yes, that is possible.

The original sentence:

• Je garde ce document jusqu’à demain matin

is the most neutral and natural order.

But French can move the time phrase to the front for emphasis:

• Jusqu’à demain matin, je garde ce document

This can sound a little more marked, as if you are emphasizing the time limit.

Both are grammatical, but the original version is usually the most straightforward in everyday speech.

A careful approximate pronunciation is:

zhuh gard suh doh-kyu-mon zhus-kah duh-man ma-tan

A few useful points:

• Je sounds like zhuh
• garde has a hard g
• ce often sounds like suh
• document in French is not pronounced like English document; the final t is silent
• jusqu’à sounds roughly like zhus-kah
• demain sounds like duh-man
• matin ends with a nasal vowel, roughly ma-tan but not with a strong final n

In natural speech, the sentence flows smoothly without strong stress on every word.