Question

their attitude surprised us ​

Answer 1

Question:-

Their attitude surprised us.

Answer:-

We were surprised by their attitude.

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Know More:-

When the performer of the action is the subject, then the sentence is in the active voice.

- You have cooked the food.

When the recipient of the action of the verb is the subject, then the sentence is in the passive voice.

- The food was cooked by you.

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Answer 2

Answer:

We were surprised by their attitude...

Explanation:

I have done it using passive voice rules