Buksan mo ang pinto gamit ang susi ko.

A word-by-word breakdown is:

• buksan = open it / open something
• mo = you / your (here, it marks the person being told to do the action)
• ang = a marker for the noun being highlighted in the sentence
• pinto = door
• gamit = using / with the use of
• ang = again, a noun marker
• susi = key
• ko = my

So the sentence literally works something like:

Open by-you the door using the key of-mine.

Natural English: Open the door using my key.

This is one of the most common questions in Filipino.

• magbukas is an actor-focus form: it emphasizes the doer of the action.
• buksan is a patient-focus form: it emphasizes the thing being opened.

Since the sentence is about the door as the main thing affected by the action, buksan is the natural choice.

Compare:

• Magbukas ka ng pinto. = Open a door.
• Buksan mo ang pinto. = Open the door.

In the second sentence, ang pinto is the focused noun, so buksan fits.

The -an is part of a verb form that often marks the action as being done to something, on something, or sometimes at/in a location.

With bukas / magbukas / buksan:

• magbukas = to open
• buksan = to open something

So buksan specifically points to an object being opened, here ang pinto.

In an imperative sentence, buksan means open it / open that thing.

In Filipino, short pronouns like mo, ko, siya, nila, and so on often come very early in the sentence, usually right after the verb or predicate.

So:

• Buksan mo ang pinto = correct, natural
• putting mo later would sound less natural or incorrect in standard structure

Here mo means the command is directed at you:

• buksan mo = you open it / open it

This is a normal pattern in commands.

Ang is a marker that identifies the noun that is in focus or prominence in the sentence.

In Buksan mo ang pinto:

• ang pinto is the thing being opened
• because the verb is in the patient-focus form buksan, the noun marked by ang is the thing affected by the action

So ang pinto is not just a door in a vague sense. It is more like the door or the specific door being talked about.

That second ang marks susi ko as the noun used as the instrument.

• gamit ang susi ko = using my key

Here ang is not marking the main topic of the whole sentence in the same way ang pinto relates to buksan, but it is still the normal marker used after gamit before a noun phrase.

So:

• gamit ang susi ko = using my key
• gamit ang kutsilyo = using a knife
• gamit ang kamay = using the hand / using your hand

Possessive pronouns like ko, mo, and niya usually come after the noun they possess.

So:

• susi ko = my key
• bahay mo = your house
• kotse niya = his/her car

This is the normal Filipino order.

So ang susi ko literally means the key of mine, but in natural English it is simply my key.

It is grammatically an imperative, so it is basically a command.

But in real life, tone and context matter a lot. Depending on how it is said, it can sound like:

• a direct command
• a neutral instruction
• a request

If you want it to sound softer or more polite, you can add polite words such as:

• Paki-buksan mo ang pinto gamit ang susi ko.
• Pakibuksan mo ang pinto gamit ang susi ko.
• Puwede mo bang buksan ang pinto gamit ang susi ko?

These sound more like Please open the door using my key or Could you open the door using my key?

The given order is very natural:

• Buksan mo ang pinto gamit ang susi ko.

You can move parts around in some contexts, but not all versions sound equally natural.

For example:

• Buksan mo ang pinto gamit ang susi ko. = very natural
• Gamit ang susi ko, buksan mo ang pinto. = also possible, especially if you want to emphasize using my key
• Ang pinto ay buksan mo gamit ang susi ko. = grammatical in a special emphasis context, but less natural in everyday speech

So yes, Filipino word order has some flexibility, but the original sentence is the most straightforward everyday version.

Yes, with my key is a perfectly good English translation here.

In Filipino, gamit often means:

• using
• by means of
• with the use of

So:

• gamit ang susi ko = using my key = with my key

In English, with is broader, but in this sentence the meaning is clearly instrumental: the key is the tool used to open the door.

This goes back to verb focus.

With magbukas, the thing being opened is often marked by ng:

• Magbukas ka ng pinto. = Open a door.

With buksan, the thing being opened is marked by ang:

• Buksan mo ang pinto. = Open the door.

So the marker changes depending on the verb form and which noun is in focus.

Very roughly:

• actor-focus verb → object often marked by ng
• patient-focus verb → object often marked by ang

That is why ang pinto is correct with buksan.

In this sentence, ang pinto usually sounds definite, so the door is the best English translation.

Filipino does not work exactly like English articles, but:

• ang pinto often points to a specific, identifiable door
• ng pinto in another structure can be less definite or more general

So in normal usage, Buksan mo ang pinto strongly suggests Open the door, not just Open a door.

The original sentence is already natural, but in speech you might hear:

• Buksan mo ang pinto gamit ’yung susi ko.
• Buksan mo ’yung pinto gamit ang susi ko.
• Pakibuksan mo ang pinto gamit ang susi ko.

A few notes:

• ’yung is a very common spoken form related to iyon and often used like that/the
• pakibuksan makes it sound more polite
• everyday spoken Filipino often mixes formal and informal patterns

So the original is clear and correct, but casual speech may use forms like ’yung more often.

A simple pronunciation guide is:

• Buksan ≈ book-sahn
• mo ≈ moh
• ang ≈ ahng
• pinto ≈ peen-toh
• gamit ≈ gah-meet
• susi ≈ soo-see
• ko ≈ koh

A few helpful notes:

• Filipino vowels are usually pure and steady: a, e, i, o, u
• ng in ang is pronounced as one sound, like the ng in song
• stress can vary by word, but saying buk-SAN or BUK-san may sound off; BUK-san with a clean a is a good practical approximation for learners

If you say the vowels clearly, you will already sound much better.