雅思写作7分在这一项要达到has good control of grammar and punctuation but may make a few errors. 6分在这一项的评分标准是make some errors in grammar and punctuation but they rarely reduce communication. 5分在这一项的评分标准是may make frequent grammatical errors and punctuation may be faulty.
A comma is used in a compound sentence before the conjunction or connective (and, but, or, for, so, nor, or yet)
a. We were tired, and we decided to have a rest. (and并列复合句用逗号)
b. Journalists have long been regarded as the conscience of society, but today many of them find it increasingly difficult to present factual news stories. (but并列复合句用逗号) 雅思作文经典句子再现
2.A comma is used after an adverbial clause or phrase before the subject of the sentence or in the middle of the sentence.
a. In the ancient palace, they saw the throne where emperors used to sit. （状语短语在句子中用逗号）
b. At lease for the foreseeable future, books will continue to be easier on the eyes. （状语短语在句子中用逗号）雅思作文经典句子再现
3.The comma is often omitted when an adverbial element follows the main clause.
a. I was trying to reach her by phone when she walked into my office. （When引导的状语从句逗号可以省略）
b. Eating a lot of junk food may cause illnesses when we get older. （When引导的状语从句逗号可以省略）雅思作文经典句子再现
c. When we get older, eating a lot of junk food may cause illnesses. （When引导的状语从句逗号没有省略）
4.Commas are used to separate a series of words or phrases having the same function in the sentence.
a.She buys bread, butter, vegetables, and many other things from this supermarket. （并列的名词之间用逗号）
b.Many modern cities are overcrowded with residential, commercial and recreational buildings.（并列的形容词之间用逗号）雅思作文经典句子再现
5.Nonrestrictive clauses and phrases are set off by commas.
a.He had to leave his hometown, where he had lived ever since he was born.（非限制性定语从句用逗号）
b. Foods such as fried chicken, hamburgers and chips contain a great deal of fat and salt, which cause major health problems like high blood pressure.（非限制性定语从句用逗号）雅思作文经典句子再现。