Active - The teacher teaches us English.
Passive - English is taught us by the teacher?
It doesn't sound correct but is it??
Active - The teacher teaches us English.
Passive - English is taught us by the teacher?
It doesn't sound correct but is it??
English is taught to us by the teacher.
As far as I'm concerned the passive form of "The teacher teaches us English" is "We are taught English by the teacher".
While the passive form "English is taught to us by the teacher " is actually that of the active " The teacher teaches English to us"
I can't say that I agree with FumbleFingers concerning the optionality of the to preposition in the passive form omission of which sounds ungrammatical to my non-native ear. To those who are learning English as a foreign language I don't recommend such omissions.
In that case, two objects are given. In which case there may be two passive forms. Both are correct.
The teacher teaches us English = The teacher teaches English to us.
Both the sentences, which are in the active voice, are grammatical.
They can be changed into the passive either starting the sentence with the indirect object or the direct object as follows:
We are taught English by the teacher.
English is taught to us by the teacher.
However, it's far more common and natural to use the verb teach in the structure "teach + somebody +something" than in the structure "teach + something + to + somebody".
So the sentences #1 and 3 are more idiomatic than the sentences #2 and 4.