Question

voice change - I saw her cutting the tree.​

Answer 1

Answer:

She was seen cutting the tree by me.

Explanation:

Answer 2

The given active sentence can be turned into passive voice as shown below:

She was seen cutting tree by me.

Explanation:

The verb in the sentence was Simple Past in the active voice form (saw). When we convert the active voice of Simple Past into passive we use passive form equivalent to the active form. The passive form in Simple past is was/were+V3 (was seen).  The object is made the subject and vice versa; and 'by' is added.