Tớ rửa tay trước khi nấu.

Tớ is an informal way to say I / me. It is commonly used with friends, classmates, or people of similar age in a casual setting.

In this sentence, tớ makes the tone friendly and natural.

Some other options are:

• tôi = more neutral or formal
• mình = casual, softer, sometimes more intimate
• tao = very informal and can sound rude unless used in the right relationship

So Tớ rửa tay trước khi nấu. sounds like something you might say to a friend.

In Vietnamese, when talking about body parts, people usually do not say the equivalent of my, your, etc. if it is already obvious whose body part it is.

So:

• rửa tay = wash hands / wash my hands / wash your hands

The owner is understood from the subject:

• Tớ rửa tay = I wash my hands

Saying rửa tay của tớ is possible in some special contexts, but it sounds unnatural in a simple everyday sentence like this.

Vietnamese nouns usually do not change form for singular or plural. So tay can mean:

• hand
• hands

The exact meaning depends on context.

In the expression rửa tay, people normally understand wash one’s hands, even though tay is not marked as plural.

If you really want to emphasize plural, you could say hai tay for two hands, but that is not necessary here.

Trước khi means before in the sense of before doing something.

Structure:

• trước khi + verb / clause

Examples:

• trước khi nấu = before cooking
• trước khi ăn = before eating
• trước khi đi ngủ = before going to sleep

So in your sentence:

• Tớ rửa tay trước khi nấu.
• literally: I wash hands before cook.
• natural English: I wash my hands before cooking.

Vietnamese does not use an equivalent of the English infinitive marker to in this structure.

After trước khi, you simply use a verb or a full clause:

• trước khi nấu
• trước khi ăn
• trước khi ra ngoài

So Vietnamese structure is more direct than English here.

Yes, nấu can often mean cook by itself when the object is understood.

• nấu = cook
• nấu ăn = cook / do cooking / prepare food

Both can work, but they are slightly different in feel:

• trước khi nấu = before cooking
• trước khi nấu ăn = before cooking food

In many everyday situations, nấu alone sounds perfectly natural because everyone understands that cooking involves food.

Yes, rửa tay is a very common everyday expression meaning wash one’s hands.

Other similar expressions include:

• rửa mặt = wash one’s face
• đánh răng = brush one’s teeth
• gội đầu = wash one’s hair

These expressions often appear without possessive words like my or your, because the body part is understood from context.

The sentence follows a very common Vietnamese order:

• Tớ = subject
• rửa tay = verb + object
• trước khi nấu = time clause

So the pattern is:

• Subject + Verb + Object + Time expression/clause

This makes the sentence very straightforward.

Yes. That is grammatically correct.

The difference is mainly tone:

• Tớ rửa tay trước khi nấu. = casual, friendly
• Tôi rửa tay trước khi nấu. = more neutral or formal

If you are speaking to a friend, tớ may sound more natural. If you are speaking in a general or polite context, tôi is safer.

Vietnamese verbs do not change form for tense the way English verbs do. The basic verb often stays the same.

So rửa can mean:

• wash
• am washing
• washed
• will wash

The exact time is understood from context or from extra time words.

In this sentence, the meaning is usually understood as a general habit or immediate action:

• I wash my hands before cooking or
• I’m washing my hands before cooking

If you want to be more specific, you can add words like:

• đã = past
• đang = ongoing
• sẽ = future

Examples:

• Tớ đã rửa tay trước khi nấu. = I washed my hands before cooking.
• Tớ đang rửa tay trước khi nấu. = I’m washing my hands before cooking.
• Tớ sẽ rửa tay trước khi nấu. = I will wash my hands before cooking.

Yes, absolutely.

• trước khi nấu = before cooking
• trước khi nấu ăn = before cooking / before preparing food

Both are natural. Nấu ăn is a bit more explicit, while nấu is shorter and very common when the meaning is obvious.

They are different kinds of wash.

• rửa = wash with water, usually for body parts, dishes, vegetables, etc.
• giặt = wash laundry, clothes, fabric

So:

• rửa tay = wash hands
• rửa bát = wash dishes
• giặt áo = wash a shirt
• giặt quần áo = do the laundry

You should use rửa in this sentence, not giặt.

A few words may be tricky for English speakers:

• tớ — has the sắc tone, so the pitch rises
• rửa — has the hỏi tone on rử
• trước — begins with tr, which is different from English ch
• nấu — has the ngã tone in standard spelling

Also, Vietnamese is tonal, so changing the tone can change the word.

For example, getting the tones right in tớ, rửa, trước, and nấu helps a lot with being understood.