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She who is a Vietnamese told me "viet sai tum lum".
So I couldn't catch what she mean with it.
So I asked her, what do you mean by viet sai tum lum?
But,

Is that expression " What do you mean by viet sai tum lum?" a right expression?
By is a preposition, not a conjunction.
Should I ask, what do you mean by that expression viet sai tum lum?
Is it okay "what do you mean by viet sai tum lum" ?

Thank you in advance for your teaching.
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What do you mean by "viet sai tum lum?"
Could you please explain what you mean by "viet sai tum lum?"
Or you could just say, What do you mean? or Could you please explain what you mean? Emotion: wink
Thank you for your teaching,ElanguestEmotion: embarrassed
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Could you please explain what you mean?
where is "DO" in the question above
...
is this also correct, could you please explain what do you mean by?
Where is 'do' in the question above? e.g. Could you please explain what do you mean?
My question is that, Both are correct or which one is correct and why? explain please, I need your helpful answer.Thank you...
My pleasure, Son James.

aicahcute and mizansinha007: No, you don't need the extra do. It is unnecessary and incorrect.
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Thank you for your additional answer,Elanguest. I know why we can't use "do" in another sentence of yours in the above. Could you explain to me what it means?" In fact, what I wanted to know is, as far as I know, "By" can't be a conjunction, Even though it is like that, it could bring a sentence. I was wondering if it has another function as conjunction.
Son James, "By"is a preposition. It is certainly not a conjuction.

Your sentence has no difference from that one " what do\did you mean by that\ by saying those words. You can assume the meaning of "by" as the preposition "with" in terms of that aspect.
Could you please explain what you mean? Mizansinha, the underlying part is a noun clause as an object.
He is trying to explain what he means.

What you mean is very important for me. The underlying part is a noun clause as a subject.

You can follow the same rules with all wh- Questions. Bear that mind, please: You should change interrogative sentences into affirmative sentences by complying with the tense of your sentences.

There are many things to say since this topic is very comprehensive. However, I hope this post will shed light on uncertanity in your mind.
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