O present perfect liga o passado ao agora. A forma: have / has + particípio (has com he, she, it).

• I have visited London. — I've visited London.
• She has lost her keys. — She's lost her keys.

Nos verbos regulares, o particípio é igual ao passado: worked, visited, finished, travelled. Nos irregulares, às vezes é uma terceira forma:

Verbo	Passado	Particípio
be	was / were	been
go	went	gone
do	did	done
see	saw	seen
eat	ate	eaten
drink	drank	drunk
find	found	found
have	had	had
buy	bought	bought
lose	lost	lost

Pergunta e negativa usam o próprio have, sem did: Have you eaten? — Yes, I have. / No, I haven't. E cuidado: she's pode ser she is ou she has — she's lost é she has lost.