Question

Robin knows the solution to this problem (change the voice)

Answer 1

The passive voice of the given sentence is as given below:

The solution to this problem is known to Robin.

Explanation

This is a unique case. Unique in the sense because of the verb ‘know’. Usually preposition ‘by’ is used in passive voice. However, with the verb ‘know’ preposition ‘to’ is used. Since the given sentence is a Present Simple Tense case. We will use is/am/are+Past Participle (V3) in the passive voice.

Answer 2

Robin knows the solution to this problem (change the voice).

For this the voice has to changes from active voice to passive voice and the answer for this sentence is as follows when we change the voice.

It is as follows Solution of this problem is known by Robin .