Question

Harry ate six shrimp at dinner----------------change into passive

Answer 1

Six shrimp were eaten by Harry at dinner.
Here the object is written first then the verb which was in V2 form is changed to V3 form then by ,and then subject.
HOPE IT HELPS

Answer 2

hello!

Harry ate six shrimp at dinner.
This sentence is in active voice.

In Active Voice , the sentence highlights the doer and not the work done.
However, in passive sentence the work is highlighted not the doer. Though both the sentences have the same meaning.

Six shrimps were eaten by Harry at dinner
This sentence is in Passive Voice.