From morning till night, why is it not correct?
the textbook keys only accept : from morning through night
I wonder why not
From morning till night.
What about?
From morning until night
From morning to night

Thank you

Question

From morning till night, why is it not correct?
the textbook keys only accept : from morning through night 
I wonder why not 
From morning till night.
What about?
From morning until night
From morning to night

Thank you

Answer

It's perfectly fine to say "From morning till night".  I don't see what the problem is.

I agree with Harry Mc that 'through' sounds odd. What textbook is this?

Answer

I agree with Harry and Su.Ki. The adverb "from morning until/till/to night" is correct.

Answer

All of those are fine. "morning through night" actually sounds a bit unusual. It would normally be "morning through to night".

Hope this helps!