Tôi thấy dấu này.

Tôi means I and is a neutral, polite way to refer to yourself.

It is very common in textbooks because it is safe and widely understood. However, in real Vietnamese, people often choose pronouns based on age, relationship, and social context. For example, instead of tôi, a speaker might say mình, em, anh, chị, or other pronouns depending on who they are talking to.

So tôi is correct here, but it is not the only possible word for I.

Thấy means to see.

In this sentence, Tôi thấy dấu này means I see this mark/sign or I can see this mark/sign.

A useful point is that thấy often focuses on the result of perception: you actually notice or perceive something. It is often different from nhìn, which is more like to look at.

For example:

• Tôi nhìn cái bảng. = I look at the board.
• Tôi thấy cái bảng. = I see the board.

So in your sentence, thấy means the speaker is perceiving the mark.

Dấu can mean several related things, depending on context:

• mark
• sign
• symbol
• accent mark/diacritic
• trace

In a learning context, especially when talking about writing or pronunciation, dấu often refers to an accent mark or tone mark.

So dấu này could mean:

• this mark
• this symbol
• this accent mark

The exact best translation depends on what is being pointed out.

In Vietnamese, words like this usually come after the noun.

So:

• dấu này = this mark
• literally: mark this

This is normal Vietnamese word order.

More examples:

• cái bàn này = this table
• người này = this person
• cuốn sách này = this book

So although English says this mark, Vietnamese says mark this.

Vietnamese usually follows a basic Subject + Verb + Object order, much like English.

So:

• Tôi = subject
• thấy = verb
• dấu này = object

That gives:

• Tôi thấy dấu này
• I see this mark

This word order is very natural and straightforward in Vietnamese.

Vietnamese does not always use a separate word in the same way English does.

In English, you might say:

• I see this mark
• I can see this mark
• I am seeing this mark (less natural in normal English)

In Vietnamese, thấy already expresses the idea of seeing/perceiving, so no extra word is necessary here.

Vietnamese often relies on context rather than adding helper verbs like English does.

Yes, often it could.

Vietnamese frequently omits the subject when it is already clear from context. So in conversation, someone might simply say:

• Thấy dấu này.

This can sound natural if everyone already knows who is speaking or who is meant.

However, Tôi thấy dấu này is a complete and clear sentence, and it is especially useful for learners because it shows the full structure.

This is a very common question.

A simple way to remember it is:

• nhìn = look at
• thấy = see

Examples:

• Tôi nhìn dấu này. = I am looking at this mark.
• Tôi thấy dấu này. = I see this mark.

Sometimes both can appear together:

• Tôi nhìn nhưng không thấy. = I look, but I do not see.

So thấy is the better choice when the meaning is about successfully perceiving something.

A rough pronunciation guide is:

• Tôi ≈ toy
• thấy ≈ thay, with a rising tone
• dấu ≈ zow, with a dipping/rising tone
• này ≈ nye, with a level tone in Southern speech, different in Northern pronunciation

A rough full approximation:

• Tôi thấy dấu này ≈ toy thay zow nye

But the tones are very important in Vietnamese, so English-style spelling can only help a little.

A few notes:

• th in thấy is an aspirated t sound, not the English th in think
• d in Southern Vietnamese can sound like y, while in Northern Vietnamese it is more like z
• tones affect meaning, so it is important to learn them along with the words

No, not necessarily.

Vietnamese often uses classifiers with nouns, but they are not required in every situation.

You could say:

• dấu này

and that is perfectly natural.

A classifier is more common with many everyday countable objects, such as:

• cái bàn này = this table
• cuốn sách này = this book

But dấu does not normally need a classifier in this kind of sentence.

Yes, absolutely.

If the context is writing, spelling, or pronunciation, dấu very often refers to an accent mark or tone mark.

For example, a teacher pointing at Vietnamese text might say:

• Tôi thấy dấu này.

In that situation, the natural English meaning could be:

• I see this accent mark
• I see this tone mark

So the sentence is flexible, and context tells you which English word fits best.