it v-link ADJ of n to-infThe adjective group follows introductory it and a link verb, and is followed by a prepositional phrase beginning with of and a to-infinitive clause. The noun group indicates the person or thing responsible for the action indicated in the to-infinitive clause.
Adjectives with this pattern belong to the following meaning groups:The 'kind' groupThe 'stupid' groupThe 'typical' group
|it|| verb group||Adjective group||of||noun group||to-infinitive clause|
|It||is||cheeky||of||us||to tell them what to do.|
|It||was||lovely||of||them||to help me.|