Question

change into voice: people spoke french in Pondicherry​

Answer 1

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French was spoken in Pondicherry.

Explanation ↴

Most of the passive constructions do not contain 'by'. In the following cases the doer with 'by' is usually avoided and the passive is generally preferred as the active form would give the vague subject (people, somebody, someone, etc).

Example ↴

People speak English all over the world. (active voice)

=> English is spoken all over the world. (passive voice)

Answer 2

Answer:

French was spoken in Pondicherry.