Hạn trả là ngày mai.

Hạn trả is a noun phrase meaning the return deadline, due date, or date something must be returned/paid back, depending on context.

• hạn = limit, deadline, due date
• trả = return, give back, pay back

So together, hạn trả is the deadline for returning something, such as a library book, or sometimes for repayment.

Là is the Vietnamese copula, similar to is / are in English in sentences that identify or equate one thing with another.

So:

• Hạn trả = the due date
• là = is
• ngày mai = tomorrow

Structure:

• Hạn trả là ngày mai.
• The due date is tomorrow.

This is a very common pattern:

• A là B = A is B

Usually, in this sentence, là should be kept.

Hạn trả ngày mai might be understood in context, but it sounds less complete and more like a label or note than a full standard sentence.

So if you want a normal, clear sentence, use:

• Hạn trả là ngày mai.

Both ngày mai and mai can mean tomorrow.

• ngày mai is a little fuller and more neutral
• mai is shorter and often more conversational

So these are both possible:

• Hạn trả là ngày mai.
• Hạn trả là mai.

The version with ngày mai may sound slightly clearer or a bit more careful in neutral speech.

Pretty much, yes.

Vietnamese:

• Hạn trả / là / ngày mai
• due date / is / tomorrow

English:

• The due date / is / tomorrow

So this sentence is nice for learners because the structure is very straightforward.

Yes, you could, but the emphasis changes.

• Hạn trả là ngày mai. = neutral: The due date is tomorrow.
• Ngày mai là hạn trả. = more like Tomorrow is the due date.

Both are understandable, but the first version is usually the more natural default if you are talking about the due date itself.

Trả has a broad meaning: to return, to give back, or to pay back.

Common examples:

• trả sách = return a book
• trả tiền = pay money
• trả nợ = repay a debt

So in hạn trả, the exact sense depends on context:

• for a library book: return deadline
• for money: repayment due date

No. Vietnamese has several related expressions, and the best one depends on context.

Some common ones are:

• hạn trả = due date for returning or paying back
• hạn chót = final deadline, cut-off date
• thời hạn = time limit, term, period
• ngày đến hạn = due date, date something becomes due

So hạn trả is good when the idea is specifically the deadline to return/pay back something.

It sounds fairly neutral.

It would work in everyday conversation, notices, or simple written communication. It is not especially slangy, and it is not highly formal either.

For example, it could fit contexts like:

• library reminders
• class assignments
• payment reminders
• everyday conversation

Trả has the hỏi tone in standard spelling.

A rough breakdown:

• tr = a sound somewhat like a retroflex or hard ch/tr depending on accent
• ả = the vowel a with the hỏi tone

Tone matters a lot in Vietnamese, so trả is different from other forms like:

• tra
• trà
• trả
• trã
• trạ

If you are learning pronunciation, it is best to listen to native audio because tones can sound different across regions.

No. Vietnamese does not use articles like the or a/an in the same way English does.

So:

• Hạn trả can mean the due date or just due date, depending on context.

Vietnamese often leaves this to context rather than marking it with a separate word.

Yes. By itself, Hạn trả là ngày mai is somewhat context-dependent.

It could mean:

• the return date for a borrowed item
• the due date for something that must be handed back
• the repayment due date

If you want to make it clearer, you can specify the object:

• Hạn trả sách là ngày mai. = The book return date is tomorrow.
• Hạn trả tiền là ngày mai. = The payment due date is tomorrow.

Yes, but it creates a slightly different structure.

• Hạn trả là ngày mai. = The due date is tomorrow.
• Đến hạn vào ngày mai. or Sẽ đến hạn vào ngày mai. = It will be due tomorrow.

So:

• hạn trả is the noun phrase due date
• đến hạn is more verbal: to become due / to reach the deadline

Both are useful, but they are not used in exactly the same way.