The key to exercise solutions in chapter 11 - Grammar for the textbook New Headway Pre-Intermediate - Workbook with authors Liz Soars, John Soars and Paul Hancock from Oxford University Press
Question
Match a line in A with a line in B.
Answer
I've been doing my homework for three hours. I'm exhausted. / I've done my homework, so I can go out with my friends now.
My son's been collecting football cards since he was six. / He's collected nearly two hundred already.
Ria has been learning English for just six months and she's fluent. / She's learned three languages in three years! She's amazing.