Question

the thief was stealing my car when I arrived began my car was​

Answer 1

My car was being stolen by the thief when I arrived.

Explanation:

• The given sentence is "The thief was stealing my car when I arrived.". We have to begin this with "My car was".

• Here we simply change the Active Voice "The thief was stealing my car" into its Passive Voice form.

• The sentence "The thief was stealing my car." is in Past Continuous Tense and its Passive Voice rule is "Object + was / were + being + Verb (Past Participle form) + by + Subject."

• Since "My car" is a Singular Number, we write "was" after it. Thus the answer follows.