Parts of Speech

There are 9 different parts of speech : Noun, Verb, Adjective, Adverb, Preposition, Pronoun, Conjnction, Interjection and Articles/Determiners. https://www.englishclub.com/grammar/parts-of-speech.htm

https://www.thoughtco.com/part-of-speech-english-grammar-1691590

There are four basic sentence structures(simple, compound, complex, compound-complex) : https://www.thoughtco.com/sentence-parts-and-sentence-structures-1689671

There are 4 functional types of sentences(declarative, interrogative, imperative, exclamatory): https://www.thoughtco.com/sentence-parts-and-sentence-structures-1689671