What is different between perfect tense and passive voice?

[callonghouse]

what is different between use of perfect tense and passive voice in speaking English.
why to use passive voice it active voice sound same as passive voice?
if necessary where to use active voice and passive voice

[Coffa]

what is different between use of perfect tense and passive voice in speaking English.
why to use passive voice it active voice sound same as passive voice?
if necessary where to use active voice and passive voice

Active voice does not sound the same as passive voice, nor does it mean the same.

I'm not sure exactly what it is that you are confused about, but consider:

1) "I have killed."
2) "I have been killed."

Both sentences are in the present perfect tense, but the first one is in active voice and the second one is in passive voice. They do not mean the same thing. Are you clear what the difference is?

[matilda]

you know, passive voice doesn't sound like perfect form AT ALL.
hey are different in use, and in usage. as you use passive, you mean you dont know the doer of the action. for example:
Alex is killed.
that means that someone who we don't know has killed alex in a past time before now, and the act of kiling is finished now.
but sometimes, we KNOW the does of the action, but the action is more important than the doer.look at the following example:
Alex was likked by Marry.
in this sentence, we know that Marry has killed ales before, but the action of killing is much more impotrtant than who the murderer is.

Hope that helps

Matilda