adverb
1
BAD : I'm sure you'll be happier from now.
GOOD : I'm sure you'll be happier from now on.
BAD : From now I shall make all the decisions myself.
GOOD : From now on I shall make all the decisions myself.
◆◆◆
from now on (WITH on ): 'From now on I'm going to work really hard and make sure I pass.'
2
See UNTIL NOW