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

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.

Grammatical Error Correction Task

Important sentence constructions in English language are

- Declarative Sentences

- Imperative Sentences

- yes-no question sentences

- wh-question sentences


San Jose State University

Some Grammar Rules

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

Speech and Language Processing (3rd ed. draft) 

Noun phrases are important for selecting proper syntactic complexity. The several different noun phrases consist of the determiner, the nominal, before the head noun, after the head noun, and before the noun phrase.

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