Present perfect, como usar corretamente?

Olá pessoal! Eu tenho uma dúvida.
Eu posso fazer uma pergunta sem utilizar o present perfect e na resposta utilizá-lo?

Ex: ASK QUESTIONS ABOUT THE UNDERLINED WORDS IN THE SENTENCES:

1- My relatives have bought five pairs of shoes at the new store.
R: Who bought five pairs of shoes at the new store?

2 -My relatives have bought five pairs of shoes at the new store.
R: What did your relatives do at the new store?

3 - My relatives have bought five pairs of shoes at the new store
R: Whose relatives have bought five pairs of shoes from the new store?

As respostas que eu dei estão corretas?

Alguém pode me dar exemplos de present perfect, com perguntas e respostas?