Subject+verb+complement.
A small number of verbs are followed not by an object, but by a complement. The commonest of these verbs is be. For example:
SUBJECT VERB COMPLEMENT
I am the sheriff.
In clauses like this the verb acts like an equal sign:
I = the sheriff.
The purpose of the complement is to complete the subject – hence its name:
SUBJECT VERB COMPLEMENT
This book is absolutely fascinating.
Peter Smithson became Managing Director.
His wife seemed very happy.
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