"Eu não consigo encontrar minha chave."

Translation: I cannot find my key.

[xmajox]

I think that correct Portuguese should have an article "a" before "minha":

"Eu não consigo encontrar a minha chave"

[Paulenrique]

Both are correct. I hope this may help you: http://duolingo.com/#/comment/64947 ;)

[xmajox]

Fair enough. In that case then, the sentence with the article should also be accepted as correct.

[Paulenrique]

Yes ;)

[Pat99480]

"I can not find my keys" and "I cannot find my keys" should be marked as the same answer.

[PinkyBrazil]

What's the difference between posso and consigo?

[Paulenrique]

Posso = I'm allowed to

Consigo = I'm able to