Question

2. Who teaches you French? In Active into passive voice​

Answer 1

French is taught to you by whom?

You change the position of the subject in order to convert to passive voice. During conversion, the subject goes from performing the action indicated by the verb, to being acted on by the verb.

The tense of the word 'teaches' which is in the simple present tense, changes to 'is taught', which is in the simple past tense.

Finally, who changes to whom, as whom is used to refer to the object of the verb (you).