جاري اعداد الموضوع
Form, Meaning and Function
Present Perfect Tense versus Simple Past
Use the present perfect to talk about an action that happened in the past when the exact time isn’t
known or important. Use the past tense when the exact time is given.
A: Have they discovered life on another planet yet? A: When did IBM introduce the first PC?
B: Yes, they have. B: It was introduced in 1981.
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