わけにはいかない ｖｓ わけがない

[Flamehearted]

Hi all,

I am looking at the following question :

マレーシアは熱帯地方だから　（＿＿＿＿＿＿）

１．雪が降らないわけがない
２．雪が降るわけがない
３。雪が降るわけにはいかない
４．雪が降るわけではない

I can see why 1 and 4 are wrong (there is no way snow can't fall and it does not mean that snow falls) however I am not sure which is the correct answer between 2 and 3.

I think two would mean "There is no way snow falls" and three would mean "It is impossible for snow to fall".

Can anyone help ?

Thanks in advance,

Martin

[hatch_jp]

わけがない = impossible to do (for some reason)
examples;
(腐(くさ)っているので)食(た)べられるわけがない = It is impossible to eat it (because it is rotten.)
(遠(とお)すぎて)行(い)けるわけがない = It is impossible to get there (because it is too far.) = It is too far to get there.


～わけにはいかない = can/must not do something (for situation reason)
examples;
このチャンスを見逃(みのが)すわけにはいけない = I can't miss this opportunity.
それを忘(わす)れるわけにはいかない。 = I mustn't forget it.
(彼女(かのじょ)がくれたから)食(た)べないわけにはいかない = I have to eat it (coz she gave me it.)
metaphrase : I mustn't not eat it. (I know this is incorrect grammer in English)

[Flamehearted]

Thanks so much Hatch - that's a brilliant and clear explanation.

So if I've got it right wakeniwaikanai is more "Must do" and wakeganai is impossible to do.

[Psy]

Thanks so much Hatch - that's a brilliant and clear explanation.

So if I've got it right wakeniwaikanai is more "Must do" and wakeganai is impossible to do.

You've got it backwards:

wake (ga) nai = in no way possible
wake niwa ikanai = mustn't/cannot (even if you wanted to, the situation forbids it)

Best to go slowly with learning expressions like this, since there are so many uses for the same general combination of sounds.