[Sửa] Tại sao, vì sao

why was he late?

sao anh ấy đến muộn?

why not?

tại sao không?

[Sửa] That's the reason why

[Sửa] Đó là lý do vì sao

not to know why

không biết tại sao

[Sửa] Lý do, lý do tại sao

[Sửa] Sao!, thế nào!

why, it's quite easy!

sao, thật là dễ!

[Sửa] tại sao

[Sửa] Adv., int., & n.

[Sửa] Adv.

[Sửa] A for what reason or purpose (whydid you do it?; I do not know why you came). b on what grounds(why do you say that?).

[Sửa] (prec. by reason etc.) for which (thereasons why I did it).

[Sửa] Int. expressing: 1 surprised discoveryor recognition (why, it's you!).

[Sửa] Impatience (why, of course Ido!).

[Sửa] Reflection (why, yes, I think so).

[Sửa] Objection (why,what is wrong with it?).

[Sửa] N. (pl. whys) a reason orexplanation (esp. whys and wherefores).

[Sửa] Why so? on whatgrounds?; for what reason or purpose? [OE hwi, hwy instr. ofhw‘t WHAT f. Gmc]