Didn't: He, she, it, I, you, we, they - past Don't: I, you, we, they - Present Doesn't: He, she, it - Present

Assim como eu, você é falante de português, então vou te ensinar em nossa lingua. As diferenças entre didn't, doesn't and don't são: didn't: Contração de did not -> É usado para o tempo verbal passado do do, negado com o not. don't: Contração de do not -> Negação do verbo Do. doesn't: Contração de does not -> É a negação do verbo DO, mas utilizado somente com: it, he e she, enquanto o do é usado com I, you, we, they Espero que tenha compreendido :D

thank you

These are contractions, so these are the shortened forms of: I do not like green eggs and ham. --> I don't like green eggs and ham. He did not do it. --> He didn't do it. She does not like eating fish. --> She doesn't like eating fish. Does that help?