I want a flight from Ontario to Chicago.

The flight should be eleven a.m. tomorrow.

The return flight should leave at around seven p.m.

Examples for Declarative Sentences from ATIS Corpus

Declarative sentences follow a subject noun phrase followed by a verb phrase construction

San Jose State University

Important sentence constructions in English language are

- Declarative Sentences

- Imperative Sentences

- yes-no question sentences

- wh-question sentences


Sentence-Level Constructions

An on-going but a helpful book resource about NLP
https://web.stanford.edu/~jurafsky/slp3/

Speech and Language Processing (3rd ed. draft) 

Declarative Sentences

Imperative sentences begin with a verb phrase and have no subject.

Commands and suggestions are imperative sentences.

Imperative Sentences

yes-no question sentences are frequently(though not always) used to ask questions.

These sentences begin with an auxiliary verb, followed by a subject NP, then followed
by a VP. 

Yes-No Question Sentences 

wh-question sentences have the most complex structure.

These sentences contain a wh-phrase, that wh-word is, one that includes a wh-word (who, whose, when, where, what, which, how, why)

There are two types of wh-question sentence structures

- wh-subject-question
- wh-non-subject-question

wh-questions

A natural language processing task that involves identifying and rectifying grammatical errors within a given text. The objective is to transform a grammatically incorrect sentence into its correct form.

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