Question

Columbus discovered American​

Answer 1

Answer:

When an active voice is changed into a passive one, the object becomes the subject and the subject becomes the object.  

The word "by" must have to be added in every passive voice sentence.  

Here, the active sentence "We expect good news" is converted into,

"Object + verb + by + subject"

Changing past tense into passive voice gives "past verb + past participle"

Thus, it becomes,  

America was discovered by Columbus.  

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