Dear Graca,
May I offer you huge thanks for helping members of the Deaf Community!
Many years ago, I learned British Sign Language to Level 2. I taught Circus Skills, and Magic, to young people at a Deaf Club. It was a revealing and rewarding experience for me.
Every country has its own specific Sign Language, and, in general, deaf people from one country can not understand the signs of another country.
Some people think that Sign Language is just a collection of haphazard finger signals. They are wrong. British Sign Language is recognised, scientifically, as a LANGUAGE, with its own words, phrases, grammar and word order. It is COMPLETELY different to the grammar, etc. of English. In the past, in the UK, deaf people were very badly treated!. Speaking people attempted to eradicate British Sign Language. Fortunately, attitudes have changed for the better since then. Some statistics say that, now, BSL is the 3rd most spoken language in the UK.
At present, I have one deaf student in the ESOL class. She is DELIGHTED that someone can �speak to her�, in her own language.
I cannot advise you about websites, but you could contact the Portuguese national society which cares for Portuguese deaf people. They probably have Flash Cards and books for sale to deaf people, and they could possibly give you advice. The British Deaf Association may be able to help you, also.
Jfaraujo gives good advice.
Speak slowly and clearly, quite loudly, (because not all are totally deaf), looking directly at the student, because many can lip-read. Use LOTS of exaggerated facial and body gestures. Use lots of mime, including using �realia � = �real, everyday things �, pens, phones, opening and closing doors, entering, exiting, etc.
Use pictures, and draw simple pictures on the Whiteboard.
I suggest that you learn a few simple Deaf Language signs: "Hello", "Goodbye", "Thank you", "Repeat", "Why?", "Slowly", for example. If you learn the Alphabet, you can spell words on your fingers, (Proper Nouns, for example). This can become quicker than stopping to write on the Whiteboard.
It should be possible to buy a basic Portuguese Sign Language Dictionary, if you want.
I wish you All the Best.
Les Douglas