B1
a way of writing or saying a word that shows if it is singular or plural, past or present, etc.
Dictionary examples:
The past form of 'eat' is 'ate', not 'eated'! (0.0)
The comparative form of 'good' is 'better', not 'gooder'! (0.0)
The present continuous form of 'sleep' is 'sleeping', not 'sleepinging'! (0.0)
"Isn't" is the short form of "is not." (10.6)
"Hers" is the possessive form of "her." (34.4)
The continuous form of "stand" is "standing." (70.1)