Now also has a general meaning of ‘nowadays’:
People used to cook three meals a day. Now nobody cooks. They just eat out of
a microwave.
Now may be premodified.
Just now,
right now and
only now are common:
A: When did you see her?
B: Just now in the café.
(very recently, in the immediate past)
I want you to go to bed right now.
(straight away, in the immediate future)
In formal contexts, when front-position now is preceded by only, subject-verb
inversion occurs:
Only now do I really understand what she meant.
(at this moment and not before)
Now … now is used in more formal literary contexts to describe an altered
sequence of actions. In such a structure now occurs at the beginning of a clause:
Do'stlaringiz bilan baham: