Here is some rules of writing English:
1) To join two independent clauses, use a comma followed by a conjunction, a semicolon alone, or a semicolon followed by a sentence modifier.
Examples:
Incorrect -- Correct
The delivery boy knew he carried strange cargo, but still ventured off unafraid.
The delivery boy knew he carried strange cargo, but he still ventured off unafraid.
My math teacher doesn't know how to lecture, she should have remained a student.
My math teacher doesn't know how to lecture; she should have remained a student.
2) Use commas to enclose subordinate clauses or phrases, which are not essential to the sentence's meaning.
Examples:
Incorrect -- Correct
The bus driver with her ears tuned to the roar decided to take the grumbling bus on a detour across the football field.
The bus driver, her ears tuned to the roar, decided to take the grumbling bus on a detour across the football field.
My window as dirty as it is reveals the beauty of nature on a snowy morning.
My window, as dirty as it is, reveals the beauty of nature on a snowy morning.
3) Do not use commas to bracket phrases that are essential to a sentence's meaning.
Examples:
Incorrect -- Correct
The man, who has too many ties, has too few necks.
The man who has too many ties has too few necks.
The cats, with six toes, are a unique attraction of the tour of Hemingway's house.
The cats with six toes are a unique attraction of the tour of Hemingway's house.
4) When beginning a sentence with an introductory phrase or an introductory (dependent) clause, include a comma.
Examples:
Incorrect -- Correct
After buying the five pound jar of marshmallow spread he set off in search of a bulk portion of peanut butter.
After buying the five pound jar of marshmallow spread, he set off in search of a bulk portion of peanut butter.
With this he bestows the responsibility of his own happiness on his mother and father.
With this, he bestows the responsibility of his own happiness on his mother and father.
5) Make the subject and verb agree with each other, not with a word that comes between them.
Examples:
Incorrect -- Correct
The cart, as well as its contents, were gone.
The cart, as well as its contents, was gone.
The girl, along with her classmates, like the new teacher.
The girl, along with her classmates, likes the new teacher.
6) Use parallel construction to make a strong point and create a smooth flow
Examples:
Incorrect -- Correct
I was glad to be departing for Australia but I was nervous when I left my apartment.
I was glad to be departing for Australia but nervous to be leaving my apartment.
The system excels at tasks such as communicating with other computers, processing records, and mathematical calculations.
The system excels at tasks such as communicating with other computers, processing records, and calculating mathematical equations.
7) Use the active voice unless you specifically need to use the passive voice
Examples:
Incorrect -- Correct
A refund was given to him by the hair regeneration company.
The hair regeneration company gave him a refund.
A good score was achieved by the team.
The team achieved a good score.
8) Omit unnecessary words.
Examples:
Incorrect -- Correct
I would like to assert that the author should be considered to be a buffoon.
The author is a buffoon.
It would be safe to say that Gregor Samsa is not the only character in Franz Kafka's The Metamorphosis to undergo drastic changes.
Gregor Samsa is not the only character in Franz Kafka's The Metamorphosis to undergo drastic change.
Before going to the supermarket, we made a list of the groceries we needed in order to make the food that we intended to eat for dinner.
Before going to the supermarket, we made a list of groceries that we needed to prepare dinner.
