invited

hi experts please let me know the following 

whats the difference between we are invited and we have been invited?

thank u

we have been invited -is an action taken place in the past but has relation with present.

we are invited -is past action and noting to do with present doings.

we have been invited is passive present perfect and means action started in past but still take place (passive)

but we are invited means present simple not in past and its present doing (passive)

thank u for ur reply ,i appreciate if u would give me atleast examples regarding the usage of we r invited and we have been invited. thank u very much

Fred:  Should we be here?

David: It's ok, we are invited?

Sue:  I have never been to this place.  Have you?

Mary: I have not, but I have been invited.  I didn't go though.

Richard: I have been invited too, and I did go!

Lisa: We are invited to go today!  We have been invited before, and today we are invited again.

I hope this helps :)

David: We are invited to go eat with them.

Fred: We have been invited to eat with them before.  It was fun.  You should go.

bogle i m confused
why dont you say “we were invited before” instead of “have been invited”??
or is there no any significant difference between them?
and what does “though” mean at the end of sentences?
thanks for upcoming replies;)

thank you sir,i am greatfull to you but i still have one  more doubt 

why dont you say “we were invited before” instead of “have been invited”??

waiting for your reply