Start on the «ow» of «now», push it up into your nose, and finish with a small «w». It is one sound, not two.
The usual mistake: English speakers say «ow» and stop. The whole character of the sound is the air going through the nose — if your nose is blocked you literally cannot make it.
- pãobread
- nãono
- mãohand
- irmãobrother
- coraçãoheart
Now the whole sentence
Não, obrigado — só quero pão.
No, thank you — I only want bread.