Dia menutup pintu dengan kuat kerana marah.

Dia can mean either he or she. Malay does not usually distinguish gender in third-person singular pronouns.

So:

• Dia = he, she, or sometimes that person, depending on context

You only know whether it is he or she from the wider situation or previous sentences.

Tutup is the base word meaning close or shut.

Menutup is the verb form with the prefix meN-, which commonly marks an active verb. In this sentence, menutup means to close / closed in the sense of someone actively shutting something.

So:

• tutup = base form
• menutup = to close / closes / closed

Malay often uses this kind of prefixed form in normal written sentences.

This happens because of Malay prefix rules.

The active verb prefix is basically meN-, but its form changes depending on the first sound of the root word. With tutup, the t changes when the prefix is added, giving:

• tutup → menutup

This is a normal sound-change pattern in Malay morphology. A learner does not always need to predict every form perfectly at first, but it is useful to recognize that menutup comes from tutup.

Malay does not have articles like the or a/an in the same way English does.

So pintu can mean:

• a door
• the door

The exact meaning depends on context. In this sentence, English naturally translates it as the door, but Malay does not need a separate word for that.

Dengan usually means with, and kuat means strong or strongly.

Together, dengan kuat means something like:

• forcefully
• hard
• with force

In this sentence, it describes how the door was shut.

So menutup pintu dengan kuat means shut the door hard / forcefully.

Malay often expresses manner using phrases rather than a special adverb form.

English can say:

• He shut the door hard

Malay commonly uses:

• dengan kuat = with force / forcefully

So instead of changing kuat into a special adverb form, Malay uses a prepositional phrase with dengan.

Kerana means because, and marah means angry or anger, depending on context.

So kerana marah literally means something like:

• because angry
• because of being angry
• because he/she was angry

Malay often leaves out words that English requires, especially forms of to be like was. So nothing is missing from a Malay point of view.

Malay does not normally use a verb equivalent to English to be in this kind of sentence.

English says:

• he was angry

Malay simply says:

• dia marah

or after kerana:

• kerana marah

This is very common. In Malay, adjectives can often function directly as predicates without is/was/am/are.

Yes, in many everyday contexts, sebab can also mean because.

So you may hear:

• Dia menutup pintu dengan kuat sebab marah.

That sounds natural in conversation.
Very roughly:

• kerana = often a bit more formal or standard in writing
• sebab = very common in speech and informal use

Both are widely understood.

Mostly yes. The sentence follows a very familiar pattern:

• Dia = subject
• menutup = verb
• pintu = object
• dengan kuat = manner
• kerana marah = reason

So it is basically:

• Subject + Verb + Object + Manner + Reason

That is one reason this sentence feels fairly approachable for English speakers.

No. Malay verbs do not normally change form for tense the way English verbs do.

So menutup by itself does not specifically mean:

• closes
• closed
• is closing

The time is understood from context. This sentence could be translated as past or present depending on the situation, although in English closed/shut may be the most natural translation in many contexts.

If Malay wants to be more specific, it can add time words such as:

• semalam = yesterday
• tadi = just now
• sekarang = now

Yes. A few natural alternatives are possible, depending on style and nuance:

• Dia menutup pintu kuat-kuat kerana marah.
  This also means He/She shut the door hard because he/she was angry. kuat-kuat is a very common way to express doing something strongly or hard.

• Dia menutup pintu dengan kasar kerana marah.
  This suggests rudely/roughly/harshly, not just with force.

• Dia hempas pintu kerana marah.
  This means more like He/She slammed the door because he/she was angry, which is stronger than just menutup pintu dengan kuat.

So the original sentence is correct, but Malay offers other natural ways to express slightly different shades of meaning.