Tôi chưa từng bay.

Chưa từng means something like have never ever or have never before.

It is a very common Vietnamese pattern for talking about life experience up to now:

• chưa = not yet
• từng = ever / having ever experienced

So Tôi chưa từng bay means I have never flown up to this point in my life.

They do different jobs:

• chưa makes the idea negative: not yet
• từng adds the idea of experience at any time before now

Together, they create the meaning have never experienced doing X.

Compare:

• Tôi chưa bay. = I haven’t flown yet / I haven’t taken the flight yet.
• Tôi chưa từng bay. = I have never flown in my life.

So chưa từng is stronger and more specifically about past experience.

Bay literally means to fly.

Depending on context, it can mean:

• to fly physically, like a bird or superhero
• to travel by plane

In everyday conversation, Tôi chưa từng bay is usually understood as I’ve never flown on a plane, unless the context suggests literal flying.

This is an important difference:

• Tôi chưa từng bay = I have never flown before

  • talks about life experience up to now

• Tôi không bao giờ bay = I never fly

  • talks more about habit, policy, preference, or refusal

So:

• If you mean it has never happened in my life, use chưa từng
• If you mean I do not do that / I avoid that, use không bao giờ

Yes, but it usually means something different.

Tôi chưa bay often means:

• I haven’t flown yet
• I haven’t left by plane yet
• My flight hasn’t happened yet

It may refer to a specific situation.

By contrast, Tôi chưa từng bay clearly means I’ve never had that experience at all.

So if you want the English meaning I have never flown, Tôi chưa từng bay is the better match.

The pattern is:

subject + chưa từng + verb

So:

• Tôi = I
• chưa từng = have never ever / have never before
• bay = fly

This pattern works with many other verbs too:

• Tôi chưa từng ăn món đó. = I have never eaten that dish.
• Cô ấy chưa từng đến Hà Nội. = She has never been to Hanoi.
• Chúng tôi chưa từng gặp anh ấy. = We have never met him.

Usually, no. That sounds awkward or overly redundant in normal Vietnamese.

Use one natural pattern:

• Tôi chưa từng bay.
• Tôi chưa bao giờ bay.

Both can mean I have never flown.

Of the two:

• chưa từng often sounds a bit concise and natural
• chưa bao giờ is also very common and very clear

So Tôi chưa từng bay and Tôi chưa bao giờ bay are both good, but mixing them together is usually unnecessary.

They are very close in meaning, and in many cases either one works.

• chưa từng + verb = have never done
• chưa bao giờ + verb = have never ever done

For most learners, you can think of them as near equivalents.

Examples:

• Tôi chưa từng bay.
• Tôi chưa bao giờ bay.

Both mean I have never flown.

A small nuance:

• từng often emphasizes experience
• bao giờ literally relates to ever/at any time

But in everyday speech, the difference is often minor.

Vietnamese does not build tenses the same way English does.

English uses helpers like:

• have
• had
• will

Vietnamese usually uses time words, aspect words, and context instead.

In Tôi chưa từng bay, the idea of have never is expressed by chưa từng, not by a separate verb like have.

So Vietnamese is not translating word-for-word. It expresses the same idea with a different grammar system.

No. Tôi is a neutral and very common way to say I, especially in general conversation.

But Vietnamese pronouns change depending on relationship, age, and situation. For example, a speaker might say:

• em chưa từng bay
• anh chưa từng bay
• mình chưa từng bay

These all can mean I have never flown, but they reflect different social relationships and tones.

For learners, tôi is a safe default in many situations.

A rough pronunciation guide is:

Tôi chưa từng bay
≈ toy chuh tuhng bay

Very roughly by syllable:

• Tôi = sounds somewhat like toy
• chưa = roughly chuh or chew-uh said quickly
• từng = a short syllable somewhat like tuhng
• bay = like English bay

The tones matter a lot, though, so an English-style spelling can only be approximate. If you are learning pronunciation, pay special attention to:

• chưa and từng, because their vowels are unfamiliar to many English speakers
• the tones on tôi, chưa, and từng

Yes. On its own, Tôi chưa từng bay is perfectly correct, but in real conversation people often add context, for example:

• Tôi chưa từng bay bằng máy bay. = I have never flown on a plane.
• Tôi chưa từng đi máy bay. = I have never traveled by plane.

These versions remove any ambiguity about the meaning of bay.

In everyday speech, đi máy bay is also very common when you specifically mean go by plane.