Is "No information known." a complete sentence?

First, what do you think, please?

I'm arguing that it is a complete sentence because it has a SUBJECT, VERB, and is a COMPLETE THOUGHT. Does this sentence need an "is"? Or can it be a complete sentence with out an "is"?

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Is "No information known." a complete sentence?

No, it's not. There is no main verb. You'd need to say eg 'No information is known' to form a correct tense.

Many definitions of a sentence do not mention 'a complete thought'. A thought is a hard thing to define. I'm not even sure my thoughts are in words at all! And 'complete' is also hard to define.

Clive

But isn't "known" the verb in this case?

olive paint 747

But isn't "known" the verb in this case?

Known is a past participle. It is a part of a verb; it is not a fully inflected verb.

The four verb parts are:

know, knew, knowing, known.

The inflected verbs are know (present tense) and knew (past tense.)

Other inflected verbs require helping (auxiliary) verbs. Auxiliary verbs are be, do and have.

e.g.

I have known him twenty years.

He is known as "Bubba" to his closest friends.

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Thank you all for your help. Do you know why programs like 'Grammarly' gave an okay to this sentence? None of the automated programs identified it has incorrect.

olive paint 747Thank you all for your help. Do you know why programs like 'Grammarly' gave an okay to this sentence?

They are not 100% reliable. Some are not even close.