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I'm learning the ～てからでなければ... grammar pattern, which my textbook defines as:
Until/unless ~ happens or is done, ... cannot happen or be done either. Used in negating or negative statements.
One of the practice problems is as follows (pick the best answer):
４時に（ ）飛行機の時間には間に合わない。
A: 起きなければ
or
B: 起きてからでなければ
The answer key says A is correct, but I don't understand why. Is there something grammatically wrong with B or is there a semantic nuance difference?
Until/unless ~ happens or is done, ... cannot happen or be done either. Used in negating or negative statements.
I agree with the definition of ～てからでなければ in this sentence.
４時に起きてからでなければ飛行機の時間には間に合わない。
Until/unless you wake up at 4 o'clock, you cannot arrive the time of departure of flight.
This is a weird situation isn't it? If you wake up before 4 o'clock say at 3 o'clock, will you miss the flight?
４時に起きなければ飛行機の時間には間に合わない。
So, this is conditional sentence.
If you don't wake up at 4 o'clock, you will miss the flight. ⇨ If you wake up before 4 o'clock, you can get on the flight.
