Choose the most appropriate answer and fill in the blanks.

The verb form of 'Hard' is _________.

The correct answer is Harden

Key Points

• Many words in English can be used in more than one part of speech.
• Let's consider the words given in options:
• Options 2,3 and 4 are adjectives.
  Option 1 is the verb.
  Verbs are formed in many ways such as:
  • By removing the last letters and adding a suffix: Authority to authorize, Apology to Apologize
  • By totally changing the word: Frost to Freeze, Grass to graze
  • By adding a suffix: Sermon to Sermonize, Knee to kneel, Hard to Harden
  • By adding a Prefix: Friend to Befriend, Fraud to Defraud, Circle to Encircle
  • ​By changing the vowels in the word: Blood to Bleed, Drop to Drip
• So Harden is the verb form of Hard.
• Thus the correct answer is Harden.