Sometimes passive sentences are described without using
auxiliary verb, when don't we use aux verbs in passive
sentence?
Example:- Insulin: A hormone secreted by the Pancreas |
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First of all,
a hormone secreted by the pancreas
is not a sentence. It is a noun phrase, that is, an expression
that refers to something. It refers to this hormone called
insulin, but it says absolutely nothing about the hormone, so it is not
a sentence.
The implied sentence in such a definition is
Insulin IS a hormone secreted by the pancreas. And, as others have already explained, this is a short way of saying
Insulin is a hormone which is secreted by the pancreas, that is,
Insulin is a hormone. This hormone is secreted by the pancreas.
__________________
Compare with this definition of
coffee:
Coffee: a beverage made from the seeds of a coffee plant
Note that
a beverage made from the seeds of a coffee plant is not a sentence. It does not say
A beverage is made from the seeds of a coffee plant.
It is just a referring expression. It refers to a certain kind of
beverage but says nothing about the beverage. The full sentence
implied by this definition is
Coffee is a beverage made from the seeds of a coffee plant.
This, of course, means
Coffee is a beverage which is made from the seeds of a coffee plant. That is,
Coffee is a beverage. This beverage is made from the seeds of a coffee plant.
CJ