Introductory it as Subject
6.2 it V adj to-infThe verb is followed by an adjective group and a to-infinitive clause. The adjective group is the Complement.
|it||Verb group||adjective group||to-infinitive clause|
|It||feels||good||to have finished a piece of work.|
|It||would look||pretty silly||to turn the proposal down.|
These verbs are concerned with what an action is, seems, or becomes. All the verbs in this group are link verbs (see Chapter 5).
appear be become feel look prove remain seem
It appears reasonable to assume that most hostel tenants would prefer single to shared rooms.
It has proven difficult to infiltrate small terrorist cells, which often are held together by family relationships.