Tôi chưa từng bay.

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Breakdown of Tôi chưa từng bay.

• chưa: not yet
• từng: (experiential marker: ever; once)
• bay: to fly

Questions & Answers about Tôi chưa từng bay.

What does chưa từng mean in this sentence?

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.

Why are both chưa and từng used together? Why not just one of them?

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.

What exactly does bay mean here?

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, is usually understood as , unless the context suggests literal flying.