Active Sentences
In active sentences, the thing doing the action is the subject of the sentence and the thing receiving the action is the object. Most sentences are active.
[Thing doing action] + [verb] + [thing receiving action]
Examples:
Passive Sentences
In passive sentences, the thing receiving the action is the subject of the sentence and the thing doing the action is optionally included near the end of the sentence. You can use the passive form if you think that the thing receiving the action is more important or should be emphasized. You can also use the passive form if you do not know who is doing the action or if you do not want to mention who is doing the action.
[Thing receiving action] + [be] + [past participle of verb] + [by] + [thing doing action]
Examples:
Examples Of Articles Containing A Passive Sentences
Mapping the chemical sequences for human DNA -- the chemical "letters" that make up the recipe of human life -- is a breakthrough that is expected to revolutionize the practice of medicine by paving the way for new drugs and medical therapies.
Ninety-nine percent of the human genome has been sequenced and 3.21 billion letters of genetic code have been assembled by Celera.
In the final step, each gene and its function must be identified. Scientists will look for the genetic variations in people -- variations that could be the cause of countless diseases.
That step is expected to take several years to complete. However, scientists said doctors one day would be able to study a person's genetic profile, determine his susceptibility to various diseases, and design a course of treatment to prevent illness.
Despite the potential for medical advancements, many Americans are divided over the implications of the genome project.
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