Introductory it as Subject
6.1 it V adj thatThe verb is followed by an adjective group and a that-clause. The adjective group is the Complement.
|it||Verb group||adjective group||that-clause|
|It||is||important||that you say exactly what you mean.|
|It||seems||certain||that elections will go ahead.|
These verbs are concerned with what a situation is, seems, or becomes. All the verbs in this group are link verbs (see Chapter 5). The word that is often omitted, as in the clause It is certain he will be there.
appear be become feel look prove remain seem
I think it's important that you get to know them beforehand.
It quickly becomes apparent that he is not mad at all.
It looks increasingly likely that the three national parties may form a government of national unity.
Though the course of events which led to the cataclysm is well known, it remains astonishing that a whole society was overthrown so easily.