Nhân viên nói rằng tài khoản đã được mở.

Nhân viên means employee, staff member, or sometimes clerk, depending on context.

In this sentence, it refers to the person speaking: the employee/staff member said something.

A few notes:

• nhân relates to person
• viên is a common element in job titles

So nhân viên is a very common everyday word for someone working at a company, office, bank, store, etc.

In this sentence, if the context is a bank, it could naturally mean the bank employee or the staff member.

Nói rằng means say that.

• nói = to say, to speak
• rằng = that introducing a reported clause

So:

• Nhân viên nói rằng... = The employee said that...

In Vietnamese, rằng is often optional in everyday speech, especially after verbs like nói, bảo, or cho biết. So you will also hear:

• Nhân viên nói tài khoản đã được mở.

That version is still natural and means the same thing.

Using rằng can make the sentence slightly clearer or a little more formal.

You can usually leave it out.

Both of these are correct:

• Nhân viên nói rằng tài khoản đã được mở.
• Nhân viên nói tài khoản đã được mở.

The version with rằng is a bit more explicit, like English that.
The version without it is very common in normal conversation.

So as a learner, it is good to recognize rằng, but you do not need to use it every time.

Vietnamese does not use articles the way English does.

So:

• nhân viên can mean an employee, the employee, or just staff
• tài khoản can mean an account or the account

The exact meaning depends on context.

For example, if you are already talking about a specific bank account, tài khoản will naturally be understood as the account. If the account has not been introduced before, it may feel more like an account.

This is very normal in Vietnamese: context does the work that English articles often do.

Tài khoản means account.

Depending on context, it could be:

• a bank account
• an online account
• a user account
• some other kind of registered account

In this sentence, mở tài khoản is a very common collocation meaning to open an account, especially a bank account.

So tài khoản đã được mở means the account has already been opened.

Đã marks that something happened before now. It often corresponds to English ideas like:

• already
• did
• has/have
• had
  depending on context

Here, đã shows that the opening happened already:

• tài khoản đã được mở = the account has been opened / the account was opened

So đã is not exactly a one-to-one equivalent of one English tense. Vietnamese does not work with tense in the same way English does. Instead, words like đã help mark time and completion.

Here, được helps form a passive meaning.

So:

• mở = open
• được mở = be opened

And with đã:

• đã được mở = has been opened / was opened

This is one of the most common uses of được in Vietnamese.

Important: được can also mean to get, to be allowed to, or successfully manage to, depending on the sentence. But in this sentence, it is part of a passive structure.

Because Vietnamese often forms the passive like this:

subject + được + verb

So:

• tài khoản = the account
• đã được mở = has been opened

The main action word mở comes after được.

This structure is very common:

• Cửa đã được đóng. = The door has been closed.
• Email đã được gửi. = The email has been sent.
• Tài khoản đã được mở. = The account has been opened.

So the order may feel different from English at first, but it is very typical Vietnamese grammar.

It can mean either, depending on context.

Vietnamese does not map neatly onto English tense forms.
Đã được mở tells you that the event happened already, but it does not force the exact English tense choice.

So in translation, it could be:

• was opened
• has been opened
• sometimes even had been opened, if the wider context requires it

In many practical contexts, especially when someone is giving you a status update, has been opened is the most natural English translation.

Sometimes yes, but the meaning and feel can shift.

• Tài khoản đã được mở clearly means the account has been opened and is explicitly passive.
• Tài khoản đã mở is shorter, but it may sound less explicit and can feel incomplete or less natural in some contexts.

For a bank or administrative situation, đã được mở is clearer and more standard when you want to emphasize that the account was opened by someone or through a process.

So as a learner, tài khoản đã được mở is the safer and more natural choice for this meaning.

Yes, it sounds fairly neutral to formal.

Reasons:

• nhân viên is standard and polite
• nói rằng is a bit more formal than just nói
• đã được mở is a standard passive form often used in official, administrative, or customer-service contexts

This kind of sentence would sound natural in places like:

• a bank
• an office
• customer support
• official notifications

In casual speech, people might simplify it a little, for example:

• Nhân viên nói tài khoản mở rồi.
• Nhân viên bảo là tài khoản đã mở rồi.

But the original sentence is very good standard Vietnamese.

A common negated version would be:

• Nhân viên nói rằng tài khoản chưa được mở.

This means:

• The employee said that the account has not been opened yet.

Here:

• chưa = not yet

That is usually the most natural negative idea in this context, because account opening is something expected to happen but has not happened yet.

A less common alternative is:

• tài khoản không được mở

But that can sound more like the account was not opened or even the account is not allowed to be opened, depending on context. So for status updates, chưa được mở is usually better.

One natural way is:

• Nhân viên nói rằng tài khoản đã được mở phải không?

This means:

• The employee said that the account has been opened, right?

Another way is to ask directly about the account:

• Tài khoản đã được mở chưa?

This means:

• Has the account been opened yet?

That second version is especially common and useful in real life.