MANGOES ARE SWEET

S + Be + Adjective
It's a non-verbal sentence.

It's a non-verbal sentence.-- What do you consider 'be', then, irmamuthiah?

it's auxiliary verb.

Auxiliary to what? Auxiliary verbs are associated with main verbs (have gone, can see, is coming, will start). In your sentence, 'be' is the main verb, a linking verb between the subject and its complement.

Yes, Thanks for the explanation Mister Micawber, I believe you're right but I've ever read at a grammar book that sentences in English classified in two parts, they are:
Non Verbal Sentence : with four types of sentences.
Nominal sentences : I am a student ( S + be + Noun)
Adjectival sentences : I am happy ( S + be + Adjective)
Adverbial se

I have looked through a lot of grammar books and never seen a sentence with a verb called a 'non-verbal' sentence. The limited use of that term is for utterances like 'Now?' and 'Hello!'

That is one strange textbook. I suggest that you explore some others.

Yes, I'll do it, thanks a lot.

1

This may be a little late, but I'm going to lend my voice to Mister Micawber on this one. In "mangoes are sweet", "are" is definitely a main verb, not an auxiliary verb. It would be a grave error to refer to this as a non-verbal sentence, as it clearly has a verb. I think you should stop reading that grammar book, if you haven't already.

Mister MicawberI have looked through a lot of grammar books and never seen a sentence with a verb called a 'non-verbal' sentence.

The term 'non-verbal sentence' surprises me too, but as for the rest of it, the newest approaches to English grammar use a classification that is different from the traditional one. I suspect that the text in question has a compara