7. Read the Learn this! box. Why are some verbs in the dialogue in exercise 5 in the past simple and others in the present perfect? Use rules a-c to explain.

LEARN THIS! Past simple and present perfect contrast a. We use the present perfect to talk about an experience at any time in the past.     I've read “The Hobbit” three times.     Have you ever traveled by helicopter? b. We use the past simple to talk about a specific occasion.     I watched a good film on TV last night.     Did you go to Newcastle last weekend? c. We often use the present perfect to ask and answer questions about an experience, and then use the past simple to give specific information about it.     Have you ever been to the USA?"     "Yes. I have. I went to New York last winter.”