0 used to ask or talk about the reasons for something -- почему?
1 used to make a suggestion -- почему бы тебе не .../почему бы не сделать что-либо?
Why don't you come with us?
Why not give it a try?
2 used to agree with something that someone has suggested -- почему бы и нет?
This is why it is much easier to determine whether a philosophical principle is true than to determine the extent of its validity.
Then why does threat simulation co-occur with psychological troubles?
Political economists and political scientists have offered a plethora of explanations for why competition in laxity remains rare in environmental and consumer policy.
It remains to be seen why (43) loses its validity for long times.
The obvious question, however, is why they are not used more in teaching design.
I would like to know why they took place.
Finding an answer to the question of why a transformation took place in prehistory, then, would ideally mean taking all factors involved into account.
It also demonstrates why that process took almost twenty-five years to begin.
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