Of grammar rules but the basic ones refer to sentence structure and parts of speech, which are noun, pronoun, verb, adjective, adverb, preposition and conjunction. Let’s look at the way sentences are put together and the words that form them.

Basic English Grammar Rules
Some of the most basic and important English grammar rules relate directly to sentence structure. Some of these rules specify that:
A singular subject needs a singular predicate.A sentence needs to express a complete thought.
Another term for a sentence is an independent clause.
Clauses, like any sentence, have a subject and predicate too. If a group of words does not have a subject and predicate, it is a phrase.If they can stand alone and make a complete thought, then they are independent and called sentences.If they do not express a complete thought, they are called "dependent clauses." An example of a dependent clause, which is not a sentence, is “when i finish my work”.
Decline in urban civility is one of the theme in Robert Lowell’s “For the Union Dead,”
Explanation:
This was only brief disruption throughout the Boston Common, however the similar scenes in the second half of the 20th century are just a normal feature of American city life. The requirements of the automotive are to be met by Art, Landscape and people themselves.
Strong buildings have been destroyed to provide car parks; the neighbourhoods are separated by highways; access by pedestrians to recreational areas is becoming confusingly difficult. In the pursuit of technological advancement, the new city provides a new savagery.
Dear Dad,
When are you bringing the milk back from the store, its been twenty two years?
Love,
Son