Com I, you, we, they, use don't + o verbo no infinitivo.
Negativas: don't
I don't like coffee.
You don't work here.
They don't speak French.
Not "I no like coffee." — say "I don't like coffee.". Para negar, use don't antes do verbo, não só 'no'.
Experimente: I ___ coffee. (don't like / doesn't like / no like) Resposta: don't like — Com I, a negativa é don't (doesn't é só para he/she/it). Então: I don't like coffee.
Negativas: doesn't
Com he, she, it, use doesn't + o verbo no infinitivo (o -s vai para o doesn't).
He doesn't work here.
She doesn't like coffee.
Not "She doesn'tlikes coffee." — say "She doesn'tlike coffee.". Doesn't já tem o -s, o verbo principal volta ao infinitivo.
Experimente: She ___ French. (doesn't speak / doesn't speaks / don't speak) Resposta: doesn't speak — Doesn't já carrega o -s, então o verbo fica no infinitivo: doesn't speak (não 'speaks').