When we convert Active voice to passive voice then word 'yesterday' used in active voice changed into 'previous day' in case of passive voice. Plz Explain eg.Active Voice - I ate an apple yesterday. Passive voice - An apple was eaten by me previous day.

Sorry, brother but you are wrong as yesterday does not change to the previous day in active to passive voice.It changes from direct to indirect speech. Eg:He said,"I went there yesterday." He said that he had gone there the previous day.

sub.+ verb+ obj. active voice obj. + verb+ by sub. passive voice in active voice sub. is active but in passive voice sub. is inactive . active voice me ( sub. koi kam krta h) passive voice me (obj. pr kam kiya jata h ) how to change AV into PV i eat a mango ( AV) (mai mango khata hu) here sub. is active bcaz sub is doing something ( yaha sub. kuch kr rha h , kya kr rha h , to kha rha h , kya kha rha h to mango . sub. kam krta h.) A mango is eaten by me (PV) (mango mere dowara khaya jata h) (yaha obj. ( mango) pr kam kiya ja rha h , kiske dowara mere dowara) you are reading voice topic.(AV) voice topic is being read by you.(PV) use verb V3 form ( always in PV) transitive verb(T.V) means voice transitive verb means verb with obj. eg : i eat a mango ( here eat is T.V) without obj. we can't change into passive voice.

sorry, brother you are wrong as yesterday does not change in the previous day it's in the case of narration where yesterday changes to previous day and tomorrow changes to the next day or the following day.Bro your example is completely wrong....may be you have taken it wrong