I've (I have) already been to China.
I've not met her in that party.
We've tried that method again.
Sandra's (Sandra has) told me everything.
It's (it has) rained all day long
Philip has just watched that movie.
I've attended to the language course in university.
You've caught a fever.
You've done well.
Jean and Tonny have got everything right in that test.

Have we met before?
Haven't you spoken to me earlier?
Have we been to China already?
Has Marisa told you everything?
Have Sam and Julie caught a fever?
Has he watched that famous movie?
Have you ever been to Brazil?
Has Mary tried to sleep?
Has Bob taken the right medicine?
Has Sarah Ribeiro done her homework without coping it from a website?

I haven't copied anything.
Leonard hasn't been to China already.
Flavescit hasn't been creative lately.
Sandra and Aline haven't always been together.
Kael hasn't dated a girl yet.
He hasn't showed any interest in girls untill now.
Marisa hasn't thought about how stupid she is.
Peter hasn't told about his sexuality to his parents.
They haven't even tried to do their homework.
Oliver hasn't always been like that.

Perceba que o Present perfect tem sempre o verbo have (I, you, we, they) e has (she, he, it) como auxiliar e logo depois o verbo principal no particípio.
Bom estudo~
Espero ter ajudado~
I like football.
I want to go home.
I need you.
I'm here!
I try do it.
I'm from Brazil.