Question

Did they visit a zoo? (change voice)​

Answer 1

were a zoo visited by them?

Answer 2

Was a zoo visited by them?

Explanation:

• The sentence given is in Simple Past Tense.
• I order to change it into a Passive Voice, we use the formula: Was/Were + Object + Verb (Past Participle form) + by + Subject?
• Since "a zoo" is Singular Number, we write "Was" for it and Past Participle form of "visit" is "visited".
• The objective form of "they" is "them".
• For Interrogative Sentences, we write the question mark in the end.