english

p.v means passive voice while a.v. means active voice. it seems that there is sth wrong with your typing or cencept. ;p

s+v+o (sentence 1b and 2b as follows) is active
while
s+being+v (past participle)+o (sentence 1a) is passive (continuous tense).

1a. i am invited to a party (by May). (this is passive voice in present tense, not active voice)
=
1b. May invites me to a party. (this is active voice in present tense)

2a. i am being invited to a party (by May). (this is also passive voice but in present continuous tense)
=
2b. May is inviting me to a party. (this is active voice in present continuous tense)

pay attention to the changes in tenses. whether to add by somebody or not depends on your preference/ content. it is not a must to add that when using passive voice.

hope this can help you.

什麼是p.v. 和 a.v.
我知a.v.係passive voice
a. v. 怎會是passive voice?
你那兩句例子都是 p.v.(passive voice) 而不是 a.v. (active voice) 但第一句好像有點問題，應該是 I was invited to a party instead of I am invited to a party.　你說：我被邀請去一個party. 你都被邀請了，是已發生了的事，所以應用過去式．

第二句是I am being invited to a party.　意思是我正在被邀請中(am being 現在進行式．例如你在跟你的朋友講電話，突然一個同事過來找你去party而你在電話告訴在電話另一邊的朋友，那你便說: I am being invited (by my colleague) to a party.

>什麼是p.v. 和 a.v.
>我知a.v.係passive voice

p.v. 係passive voice
a.v. 係active voice

>如果要把主動句改為被動句
>e.g s+v+o 改為 s+being+v+o
s+v+o is active
o+v+s is passive

s+being+v+o is wrong. It is not active or passive.

Being 有continuous(進行)之意, 與active passive 無關

>i am invited to a party
>改為
>i am being invited to a party
>重有一個好似係+by
>please help

I am invited to a party 係 simple present tense 既 passive
I am being invited to a party 係 present continuous tense 既 passive
by在passise voice可有可無
有by: I am invited by John to a party.
無by: I am invited to a party.

若用Active voice 係: Someone invites me to a party

A party was intited by me