The passive is formed with the verb be and a past participle. We change an active sentence into a passive sentence in the following way. The object of the verb in the active sentence becomes the subject of the verb in the passive sentence. The verb be is used in the correct form together with the past participle of the main verb in the active sentence They have never recorded rain in this area. Rain has never been recorded in this area In this example we do not know who has recorded the rain and the information is not very important, so we do not include the word they in passive Sometimes to know who or is responsible for the action. In a passive sentence the word by comes before this information. The sun warms the earth during the day. The earth is warmed by the sun during the day