语法

it v-link ADJ for n to-inf

The 'necessary' and 'important' group

These adjectives indicate that an action or situation is necessary or important, or not necessary or important. The action or situation is indicated by the prepositional phrase beginning with for and the to-infinitive clause.
At one time it was compulsory for students to come to the degree congregation.
It is essential for there to be established codes of practice.
He said it was also important for students to have a firm grounding in any subject before they learnt how to teach it.
It's quite unnecessary for you to bother yourself with complex arithmetic when you have better things to do.
  • compulsory
  • critical
  • crucial
  • essential
  • imperative
  • important
  • necessary
  • needful
  • obligatory
  • unnecessary
  • vital
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