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Active transport requires energy while passive transport does not.
Some are passive (e.g. melanin) and some are active (e.g. actin, myosin).
"Eaten" is a passive verb form as it indicates that the subject of the sentence is receiving the action of eating.
Passive is formed with be verb + past participlepresent simple active = eat / asks. passive = is eaten / is askedpast simple active = ate /asked. passive = was eaten / was askedpresent continuous active = is eating / are asking. passive = is being eaten / are being askedpast continuous active = was asking / were eating. passive = was being asked / were being eatenpresent perfect active = has asked / have eaten. passive = has been asked / have been eaten.past perfect active = had asked / had eaten. passive = had been asked / had been eatenIn active sentences the subject or actor (the doer of the action of the verb) comes at the before the verb eg:The dog chased the cat.In this sentence the dog is the doer of the action 'chased'.Passive sentences allow us to put some thing else that is not the subject in the position of the subject eg:The cat was chased (by the mouse). The actor/agent 'by the mouse' - can be left out
To change a sentence from active to passive voice, move the object of the active sentence to the subject position in the passive sentence and add a form of the verb "to be" along with the past participle of the main verb. For example, "I ate the cake" in active voice becomes "The cake was eaten by me" in passive voice.
A passive sentence says that something happened but doesn't say who caused it to happen. For example: food was eaten. An active sentence says who did it. For example: Tom ate the food.
You can change the active voice to the passive voice by changing an object to a subject, as follows: let us say that your original sentence is Fred has eaten dinner. That is the active voice. Dinner is the object. In the passive voice dinner becomes the subject, so the sentence becomes, dinner has been eaten. Fred, the original subject, has disappeared. We no longer know who ate the dinner, we merely know that it has been eaten by someone. The passive voice is therefore distinguished by being less informative. It is used by people who are trying to evade responsibility for something, or to avoid being specific. Something happened but we can't say who did it.ANDThe form of passive is be + past participleeg - been eaten, being eaten, was cooked, is cooked,The passive allows us to leave the 'doer' of the verb out of the sentence. This is useful if the 'doer' is not important. egThe Mona Lisa was painted in the 16th century.If you want to say who does the action of a passive verb add by + pronoun / noun phrase at the end of the sentence. This is called the agent.The dinner was eaten by Fred.This is useful if you want to emphasis the agent egThe painting is very valuable. It was painted by Van Gogh.
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== == "English grammer active and passive voice change from active to passive .
is a thermocouple an active or passive transducer?-why?
Passive is to change as active is to affect.
passive
Passive