Tôi gấp áo.

• Tôi = I
• gấp = fold
• áo = shirt / top / garment for the upper body

So the sentence structure is very straightforward: I + fold + shirt.

Yes. Vietnamese usually uses Subject + Verb + Object, just like English in a simple sentence.

So:

• Tôi = subject
• gấp = verb
• áo = object

That is why Tôi gấp áo. matches English word order very closely.

Vietnamese does not use articles like English a, an, and the.

So áo can mean:

• a shirt
• the shirt
• sometimes just shirt/shirts in a general sense

The exact meaning depends on context.

For example, if the situation is already clear, Tôi gấp áo can naturally mean I’m folding the shirt or I fold shirts.

Usually, áo by itself means a piece of clothing worn on the upper body, such as a shirt, top, jacket, or similar garment.

If you want to say clothes in general, Vietnamese more often uses quần áo.

So:

• áo = shirt/top/upper-body garment
• quần áo = clothes

Because of that, Tôi gấp áo. is grammatical, but depending on the intended meaning, a native speaker might also say:

• Tôi gấp cái áo. = I fold the shirt.
• Tôi gấp quần áo. = I fold clothes.

Not always.

Vietnamese classifiers are often used when referring to a specific countable thing, especially in natural everyday speech. For one shirt, cái áo is very common.

So:

• áo = shirt, in a more general or less specific way
• cái áo = a/the shirt, more explicitly referring to one item

That means:

• Tôi gấp áo. = acceptable
• Tôi gấp cái áo. = often more natural if you mean one specific shirt

You usually know from context, because Vietnamese does not have verb endings like English fold / folded / will fold.

So Tôi gấp áo. could mean different things depending on the situation:

• I fold shirts
• I am folding a shirt
• I folded the shirt
• I will fold the shirt

If you want to make the time clearer, you can add time words or aspect markers:

• Tôi đang gấp áo. = I am folding the shirt.
• Tôi đã gấp áo. = I folded / have folded the shirt.
• Tôi sẽ gấp áo. = I will fold the shirt.

A simple learner-friendly guide:

• gấp: the tone is rising. The final p is short and unreleased, so it stops quickly.
• áo: this also has a rising tone.

Very roughly:

• gấp sounds a bit like gup with a short clipped ending
• áo sounds somewhat like ow in now, but with a rising tone

Important note: these are only rough approximations. The tones matter a lot in Vietnamese, so it is best to hear native audio if possible.

No. Tôi is a common, neutral way to say I, but Vietnamese pronouns depend a lot on relationship, age, and social situation.

For example, a speaker might say:

• tôi = neutral, polite
• mình = friendly/intimate in some contexts
• em, anh, chị, etc. = used depending on who is speaking to whom

For a basic learner sentence, tôi is a very safe and standard choice.

Yes. That would be very natural if you want to emphasize that the action is happening right now.

Compare:

• Tôi gấp áo. = neutral; context decides the time
• Tôi đang gấp áo. = I am folding the shirt right now

So đang is useful when you want a clear present-progressive meaning.

It is grammatical and understandable, but in real speech a native speaker might choose a slightly more specific version depending on the meaning:

• Tôi gấp cái áo. = I fold the shirt.
• Tôi đang gấp cái áo. = I am folding the shirt.
• Tôi gấp quần áo. = I fold clothes.
• Tôi đang gấp quần áo. = I am folding clothes.

So Tôi gấp áo. is fine as a simple learning sentence, but everyday Vietnamese often adds a classifier or uses quần áo if the meaning is clothes.