Giáo viên của Lan nói bài tập hôm nay không khó, chỉ cần đọc rất cẩn thận.

Của is a very common word for possession or association.

So giáo viên của Lan means Lan’s teacher or the teacher of Lan.

This is important because without của, the meaning could change:

• giáo viên của Lan = Lan’s teacher
• giáo viên Lan often sounds more like Teacher Lan (a teacher named Lan)

So in this sentence, của clearly shows the relationship.

In Vietnamese, time expressions can come after a noun to describe it.

So:

• bài tập hôm nay = today’s exercise / today’s assignment

This is very natural in Vietnamese. It works like:

• cuộc họp ngày mai = tomorrow’s meeting
• bài báo hôm qua = yesterday’s article

So hôm nay is modifying bài tập, not acting as a separate time word for the whole sentence.

It can mean either one, depending on context.

Bài tập is a general word for:

• an exercise
• a practice task
• schoolwork
• homework

In this sentence, it could mean:

• today’s exercise
• today’s assignment
• today’s homework

The exact English choice depends on the situation, but the Vietnamese itself is perfectly normal.

Vietnamese often leaves out the equivalent of English that in reported speech.

So:

• Giáo viên của Lan nói bài tập hôm nay không khó...

is natural and means:

• the teacher said that today’s assignment was not difficult

If you want, Vietnamese can include a linker such as rằng or sometimes là:

• Giáo viên của Lan nói rằng bài tập hôm nay không khó
• Giáo viên của Lan nói là bài tập hôm nay không khó

But in everyday Vietnamese, leaving it out is very common.

Both are possible, but they are not exactly identical in tone.

• không khó = not difficult
• dễ = easy

Không khó is often a little softer or more cautious. It suggests:

• it is not hard
• but maybe you still need to pay attention

That fits well with the next part:

• chỉ cần đọc rất cẩn thận = you just need to read very carefully

So the sentence is not saying the assignment is extremely easy. It is saying it is manageable if you are careful.

Chỉ cần means just need to, only need to, or all you have to do is.

Breakdown:

• chỉ = only, just
• cần = need

So:

• chỉ cần đọc rất cẩn thận = you just need to read very carefully

This structure is very common in Vietnamese when giving simple instructions or emphasizing that something is enough.

The subject is omitted because it is understood from context.

Vietnamese often drops subjects when they are obvious. Here, the understood subject is something like:

• the students
• you
• Lan
• whoever is doing the assignment

So the sentence does not need to say:

• chỉ cần em đọc rất cẩn thận
• chỉ cần các em đọc rất cẩn thận

because it is already clear enough.

This kind of omission is very common and natural in Vietnamese.

The object is also omitted because it is easy to guess from context.

Đọc means read, and here the missing object is probably something like:

• the exercise
• the instructions
• the questions
• the text carefully

So đọc rất cẩn thận does not sound incomplete in Vietnamese. It is normal to leave out the object when everyone already knows what is being talked about.

English often wants the object stated more clearly, but Vietnamese often does not.

Yes, cẩn thận is often taught as an adjective meaning careful, but in Vietnamese many adjective-like words can also function directly after a verb in an adverb-like way.

So:

• đọc cẩn thận = read carefully

Vietnamese does not need a separate -ly ending like English.

And rất intensifies it:

• rất cẩn thận = very carefully / very careful

So the pattern is:

• đọc
  • cẩn thận
• verb + manner word

This is a very common Vietnamese structure.

The comma separates the main statement from the explanation or advice that follows.

Structure:

• Giáo viên của Lan nói bài tập hôm nay không khó
• chỉ cần đọc rất cẩn thận

The second part explains why it is not difficult, or what is needed to handle it successfully.

In English, you might think of it as something like:

• It isn’t hard; you just need to read very carefully.

So the comma helps show that the second part is an added clarification.

Not explicitly.

Vietnamese often does not mark tense the way English does. Instead, time is understood from:

• context
• time words
• the situation

Here:

• hôm nay tells you the assignment is for today
• nói by itself does not force a strict tense like said vs says

Depending on context, nói could be understood as:

• says
• said
• has said

So Vietnamese relies more on context than on verb changes.