Question: what are the five key principles of grammar?
Answer: Word order. Word order is the most important element of what is known as syntax. ... 
Punctuation. Punctuation is another main element of syntax. ... 
3 Tense and aspect. Tense and aspect are the most import parameters applying to verbs; and verbs are fundamental to all statements. ... 
4 Use of determiners. ... 
5 Use of connectors.