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Hello

I have a question about passive.

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; why we don't say "A hormone is secreted by the Pancreas."?

Thanks
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Comments  
«why we don't say "A hormone is secreted by the Pancreas."?»

It's rather: A hormone which is secreted by the Pancreas. That's the meaning.

As to the grammar, I can't say what it is.
Ant_222 As to the grammar, I can't say what it is.
A hormone which is secreted by the Pancreas -- whiz deletion
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«... — whiz deletion»
Oh...
OK, why was the aux verb omitted?
«OK, why was the aux verb omitted?»

1. A hormone which is secreted by the Pancreas
2. A hormone is secreted by the Pancreas
3. A hormone secreted by the Pancreas

Sentences #1 and #2 have different meanings. The first refers to a specific type of hormone, namely — the one that is produced in the Pancreas. The second sentence just says that the Pancreas produce some hormone.

#1 is not even a sentence because it has no predicate. It acts like a single noun. In any text you can replace the word "Insuline" by one of the phareses: #1 or #3.

#3 has exactly the same meaning as #1.
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Thanks, I got it

But are there other cases else for omitting the aux very when describing passive sentences?
Onh1986OK, why was the aux verb omitted?
The relative pronoun which/who and the subsequent conjugated auxiliary be can be omitted by ellipsis. This is a rule: whiz deletion.
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
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.
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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
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