Question

I taught English to my sister into passive voice..​

Answer 1

I taught English to my sister.

• My sister was taught English by me.

Here,

Active Voice

Structure - subject + V2 + object.

Passive voice

Structure - Here object is the subject and we have to replace past tense into past continuous tense we have to use was and were here. After that we have to use by and then replace subject into object.

subject + was/were + V3 + by + object.

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Answer 2

My sister was taught English by me.