be
been
I/be/to Madagascar.
I've been to Madagascar.
I/not see/him since last Monday.
I haven't seen him since last Friday.
keep
kept
They/read/The Hobbit/twice.
They've read Hobbit twice.
I/not watch/my favorite/series/lately.
I haven't watched my favourite series lately.
become
become
They/be married/for/fifty years.
They've been married for fifty years
I'm hungry. I/ eat/ lunch/yet.
I'm hungry. I haven't had lunch yet.
grow
grown
I/homework/do/maths/already
I've already done my maths homework.
I/not see/yet/cartoon/new/
I haven't seen the new cartoon yet.
forget
forgotten
Neil's incredible! He/ learn/ Spanish/ Chinese/ French/ and/already
Neil's incredible! He has already learned Spanish, Chinese and French.
I/meet/his/never/sister.
I have never met his sister.