Questions & Answers about Dù nhớ mã PIN, tôi cũng không nói.
It is a very common Vietnamese pattern meaning something like:
- even though ... still ...
- although ... still ...
- sometimes even if ... still ...
So in Dù nhớ mã PIN, tôi cũng không nói, the structure is:
- Dù nhớ mã PIN = even though I remember the PIN
- tôi cũng không nói = I still won’t say it / I still don’t say it
The word cũng helps create that “still / nevertheless” idea.
So dù ... cũng ... works a lot like although ..., still ... in English.
Yes, Dù tôi nhớ mã PIN, tôi cũng không nói is completely grammatical.
But Vietnamese often omits a repeated subject when it is obvious from context. Since the second clause already has tôi, the first clause can leave it out:
- Dù nhớ mã PIN, tôi cũng không nói.
- Dù tôi nhớ mã PIN, tôi cũng không nói.
Both mean the same thing.
This kind of omission is very normal in Vietnamese, especially when the subject of both clauses is the same.