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This is a pen.
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Comments 
SVC
Subject - Verb - Object (SVO)
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AnonymousSubject - Verb - Object (SVO)
How can it possibly be SVO? Only transitive verbs take objects, and the verb "be" is certainly not transitive!

As MM said, it's SVC (Subject-Verb-Predicative Complement)

BillJ
I agree.
BillJ Anonymous Subject - Verb - Object (SVO) How can it possibly be SVO? Only transitive verbs take objects, and the verb "be" is certainly not transitive!As MM said, it's SVC (Subject-Verb-Predicative Complement) BillJ
I bitterly hold onto my initial statement (SVO) knowing about the upcoming fierce opposition.Emotion: dog

This IS a pen.

IS can be interpreted also as NAMING (possibly for the first time) the object (pen) thus linguistically acting on it.
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Can you find a legitimate grammar book (or dictionary) that supports your position?

See, for example definition #6
http://dictionary.reference.com/browse/be
be
verb (used without object)
6. (used as a copula to connect the subject with its predicate adjective, or predicate nominative, in order to describe, identify, or amplify the subject): Martha is tall. John is president. This is she.
And it would also be good if you registered as a member, so that we don't get confused about which 'Anonymous' we are discussing this with.
When using IS to NAME an object, an imperative sentence is formed, which is context-dependent.

And now, by the power invested in me, I will name my creations.
This IS...
This IS a pen.
This IS...
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